diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2aaf536a3..6a9647800 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -26,10 +26,11 @@ Bugsnag Notifiers on other platforms.
   from the default convenience `init()` to ensure that `apiKey` has a value set.  The `apiKey`
   must now be a correctly formatted one to be accepted.
 
-  * Swift: `try BugsnagConfiguration(_ apiKey)`
-  * Objective C: `[[BugsnagConfiguration alloc] initWithApiKey:error:]`
+  * Swift: `BugsnagConfiguration(_ apiKey)`
+  * Objective C: `[[BugsnagConfiguration alloc] initWithApiKey:]`
 
   [#446](https://github.com/bugsnag/bugsnag-cocoa/pull/446)
+  [#492](https://github.com/bugsnag/bugsnag-cocoa/pull/492)
 
 * Support editing breadcrumbs within an Event as objects. Breadcrumbs can now be
   inspected and modified from callbacks, for example:
diff --git a/Source/BugsnagConfiguration.h b/Source/BugsnagConfiguration.h
index af2cbbf16..c47cd9748 100644
--- a/Source/BugsnagConfiguration.h
+++ b/Source/BugsnagConfiguration.h
@@ -38,7 +38,6 @@
 /**
  * BugsnagConfiguration error constants
  */
-extern NSString * _Nonnull const BSGConfigurationErrorDomain;
 typedef NS_ENUM(NSInteger, BSGConfigurationErrorCode) {
     BSGConfigurationErrorInvalidApiKey = 0
 };
@@ -238,10 +237,9 @@ BugsnagBreadcrumbs *breadcrumbs;
 /**
  * The designated initializer.
  */
-- (instancetype _Nullable)initWithApiKey:(NSString *_Nonnull)apiKey
-                                   error:(NSError *_Nullable *_Nullable)error
+- (instancetype _Nonnull)initWithApiKey:(NSString *_Nonnull)apiKey
     NS_DESIGNATED_INITIALIZER
-    NS_SWIFT_NAME(init(_:)) __attribute__((swift_error(nonnull_error)));
+    NS_SWIFT_NAME(init(_:));
 
 /**
  * Set the endpoints to send data to. By default we'll send error reports to
diff --git a/Source/BugsnagConfiguration.m b/Source/BugsnagConfiguration.m
index b994f90cc..d04e22161 100644
--- a/Source/BugsnagConfiguration.m
+++ b/Source/BugsnagConfiguration.m
@@ -40,7 +40,6 @@
 static NSString *const BSGApiKeyError = @"apiKey must be a 32-digit hexadecimal value.";
 static NSString *const BSGInitError = @"Init is unavailable.  Use [[BugsnagConfiguration alloc] initWithApiKey:] instead.";
 static const int BSGApiKeyLength = 32;
-NSString * const BSGConfigurationErrorDomain = @"com.Bugsnag.CocoaNotifier.Configuration";
 
 // User info persistence keys
 NSString * const kBugsnagUserKeychainAccount = @"BugsnagUserKeychainAccount";
@@ -104,15 +103,10 @@ - (instancetype)init {
 /**
  * The designated initializer.
  */
--(instancetype)initWithApiKey:(NSString *)apiKey
-                        error:(NSError * _Nullable __autoreleasing * _Nullable)error
+- (instancetype _Nonnull)initWithApiKey:(NSString *_Nonnull)apiKey
 {
-    if (! [BugsnagConfiguration isValidApiKey:apiKey]) {
-        *error = [NSError errorWithDomain:BSGConfigurationErrorDomain
-                                     code:BSGConfigurationErrorInvalidApiKey
-                                 userInfo:@{NSLocalizedDescriptionKey : @"Invalid API key.  Should be a 32-digit hex string."}];
-        
-        return nil;
+    if (![BugsnagConfiguration isValidApiKey:apiKey]) {
+        bsg_log_err(@"Invalid configuration. apiKey should be a 32-character hexademical string, got \"%@\"", apiKey);
     }
     
     self = [super init];
diff --git a/Tests/BugsnagBaseUnitTest.m b/Tests/BugsnagBaseUnitTest.m
index 27df96107..3929776f2 100644
--- a/Tests/BugsnagBaseUnitTest.m
+++ b/Tests/BugsnagBaseUnitTest.m
@@ -40,8 +40,7 @@ -(void)setUpBugsnagWillCallNotify:(bool)willNotify
 -(void)setUpBugsnagWillCallNotify:(bool)willNotify
                    andPersistUser:(bool)willPersistUser
 {
-    NSError *error;
-    BugsnagConfiguration *configuration = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1 error:&error];
+    BugsnagConfiguration *configuration = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1];
     [configuration setPersistUser:willPersistUser];
     
     if (willNotify) {
diff --git a/Tests/BugsnagBreadcrumbsTest.m b/Tests/BugsnagBreadcrumbsTest.m
index 8c395dd0d..fe318cc20 100644
--- a/Tests/BugsnagBreadcrumbsTest.m
+++ b/Tests/BugsnagBreadcrumbsTest.m
@@ -294,8 +294,7 @@ - (void)testBreadcrumbFromDict {
  */
 - (void)testCallbackFreeConstructors2 {
     // Prevent sending events
-    NSError *error;
-    BugsnagConfiguration *configuration = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1 error:&error];
+    BugsnagConfiguration *configuration = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1];
     [configuration addOnSendBlock:^bool(BugsnagEvent * _Nonnull event) { return false; }];
     [Bugsnag startBugsnagWithConfiguration:configuration];
 
@@ -362,8 +361,7 @@ - (void)testCallbackFreeConstructors2 {
  */
 - (void)testCallbackFreeConstructors3 {
     // Prevent sending events
-    NSError *error;
-    BugsnagConfiguration *configuration = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1 error:&error];
+    BugsnagConfiguration *configuration = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1];
     [configuration addOnSendBlock:^bool(BugsnagEvent * _Nonnull event) { return false; }];
     [Bugsnag startBugsnagWithConfiguration:configuration];
 
diff --git a/Tests/BugsnagConfigurationTests.m b/Tests/BugsnagConfigurationTests.m
index 046fd986b..e64592f89 100644
--- a/Tests/BugsnagConfigurationTests.m
+++ b/Tests/BugsnagConfigurationTests.m
@@ -43,17 +43,17 @@ @implementation BugsnagConfigurationTests
 // =============================================================================
 
 - (void)testDefaultSessionNotNil {
-    BugsnagConfiguration *config = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1 error:nil];
+    BugsnagConfiguration *config = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1];
     XCTAssertNotNil(config.session);
 }
 
 - (void)testDefaultSessionConfig {
-    BugsnagConfiguration *config = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1 error:nil];
+    BugsnagConfiguration *config = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1];
     XCTAssertTrue([config autoTrackSessions]);
 }
 
 - (void)testSessionApiHeaders {
-    BugsnagConfiguration *config = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1 error:nil];
+    BugsnagConfiguration *config = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1];
     NSDictionary *headers = [config sessionApiHeaders];
     XCTAssertEqualObjects(config.apiKey, headers[@"Bugsnag-Api-Key"]);
     XCTAssertNotNil(headers[@"Bugsnag-Sent-At"]);
@@ -61,7 +61,7 @@ - (void)testSessionApiHeaders {
 }
 
 - (void)testSessionEndpoints {
-    BugsnagConfiguration *config = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1 error:nil];
+    BugsnagConfiguration *config = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1];
     
     // Default endpoints
     XCTAssertEqualObjects([NSURL URLWithString:@"https://sessions.bugsnag.com"], config.sessionURL);
@@ -72,7 +72,7 @@ - (void)testSessionEndpoints {
 }
 
 - (void)testSetEmptySessionsEndpoint {
-    BugsnagConfiguration *config = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1 error:nil];
+    BugsnagConfiguration *config = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1];
     [config setEndpointsForNotify:@"http://notify.example.com" sessions:@""];
     BugsnagSessionTracker *sessionTracker
             = [[BugsnagSessionTracker alloc] initWithConfig:config postRecordCallback:nil];
@@ -83,7 +83,7 @@ - (void)testSetEmptySessionsEndpoint {
 }
 
 - (void)testSetMalformedSessionsEndpoint {
-    BugsnagConfiguration *config = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1 error:nil];
+    BugsnagConfiguration *config = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1];
     [config setEndpointsForNotify:@"http://notify.example.com" sessions:@"f"];
     BugsnagSessionTracker *sessionTracker
             = [[BugsnagSessionTracker alloc] initWithConfig:config postRecordCallback:nil];
@@ -100,7 +100,7 @@ - (void)testAddOnSessionBlock {
     
     // Setup
     __block XCTestExpectation *expectation = [self expectationWithDescription:@"Remove On Session Block"];
-    BugsnagConfiguration *config = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1 error:nil];
+    BugsnagConfiguration *config = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1];
     [config setEndpointsForNotify:@"http://notreal.bugsnag.com" sessions:@"http://notreal.bugsnag.com"];
     XCTAssertEqual([[config onSessionBlocks] count], 0);
     BugsnagOnSessionBlock sessionBlock = ^(NSMutableDictionary * _Nonnull sessionPayload) {
@@ -124,7 +124,7 @@ - (void)testRemoveOnSessionBlock {
     __block XCTestExpectation *calledExpectation = [self expectationWithDescription:@"Remove On Session Block"];
     calledExpectation.inverted = YES;
 
-    BugsnagConfiguration *config = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1 error:nil];
+    BugsnagConfiguration *config = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1];
     [config setEndpointsForNotify:@"http://notreal.bugsnag.com" sessions:@"http://notreal.bugsnag.com"];
     XCTAssertEqual([[config onSessionBlocks] count], 0);
     BugsnagOnSessionBlock sessionBlock = ^(NSMutableDictionary * _Nonnull sessionPayload) {
@@ -158,7 +158,7 @@ - (void)testAddOnSessionBlockThenRemove {
     __block XCTestExpectation *expectation4 = [self expectationWithDescription:@"Remove On Session Block 4"];
     expectation4.inverted = YES;
 
-    BugsnagConfiguration *config = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1 error:nil];
+    BugsnagConfiguration *config = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1];
     [config setEndpointsForNotify:@"http://notreal.bugsnag.com" sessions:@"http://notreal.bugsnag.com"];
     XCTAssertEqual([[config onSessionBlocks] count], 0);
     
@@ -213,7 +213,7 @@ - (void)testAddOnSessionBlockThenRemove {
  * Make sure slightly invalid removals and duplicate additions don't break things
  */
 - (void)testRemoveNonexistentOnSessionBlocks {
-    BugsnagConfiguration *config = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1 error:nil];
+    BugsnagConfiguration *config = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1];
     XCTAssertEqual([[config onSessionBlocks] count], 0);
     BugsnagOnSessionBlock sessionBlock1 = ^(NSMutableDictionary * _Nonnull sessionPayload) {};
     BugsnagOnSessionBlock sessionBlock2 = ^(NSMutableDictionary * _Nonnull sessionPayload) {};
@@ -242,47 +242,47 @@ - (void)testRemoveNonexistentOnSessionBlocks {
 // =============================================================================
 
 - (void)testNotifyReleaseStagesDefaultSends {
-    BugsnagConfiguration *config = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1 error:nil];
+    BugsnagConfiguration *config = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1];
     XCTAssertTrue([config shouldSendReports]);
 }
 
 - (void)testNotifyReleaseStagesNilSends {
-    BugsnagConfiguration *config = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1 error:nil];
+    BugsnagConfiguration *config = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1];
     config.releaseStage = @"beta";
     config.notifyReleaseStages = nil;
     XCTAssertTrue([config shouldSendReports]);
 }
 
 - (void)testNotifyReleaseStagesEmptySends {
-    BugsnagConfiguration *config = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1 error:nil];
+    BugsnagConfiguration *config = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1];
     config.releaseStage = @"beta";
     config.notifyReleaseStages = @[];
     XCTAssertTrue([config shouldSendReports]);
 }
 
 - (void)testNotifyReleaseStagesIncludedSends {
-    BugsnagConfiguration *config = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1 error:nil];
+    BugsnagConfiguration *config = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1];
     config.releaseStage = @"beta";
     config.notifyReleaseStages = @[ @"beta" ];
     XCTAssertTrue([config shouldSendReports]);
 }
 
 - (void)testNotifyReleaseStagesIncludedInManySends {
-    BugsnagConfiguration *config = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1 error:nil];
+    BugsnagConfiguration *config = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1];
     config.releaseStage = @"beta";
     config.notifyReleaseStages = @[ @"beta", @"production" ];
     XCTAssertTrue([config shouldSendReports]);
 }
 
 - (void)testNotifyReleaseStagesExcludedSkipsSending {
-    BugsnagConfiguration *config = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1 error:nil];
+    BugsnagConfiguration *config = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1];
     config.releaseStage = @"beta";
     config.notifyReleaseStages = @[ @"production" ];
     XCTAssertFalse([config shouldSendReports]);
 }
 
 - (void)testDefaultReleaseStage {
-    BugsnagConfiguration *config = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1 error:nil];
+    BugsnagConfiguration *config = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1];
 #if DEBUG
     XCTAssertEqualObjects(@"development", config.releaseStage);
 #else
@@ -295,7 +295,7 @@ - (void)testDefaultReleaseStage {
 // =============================================================================
 
 - (void)testNotifyEndpoint {
-    BugsnagConfiguration *config = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1 error:nil];
+    BugsnagConfiguration *config = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1];
     XCTAssertEqualObjects([NSURL URLWithString:@"https://notify.bugsnag.com/"], config.notifyURL);
 
     // Test overriding the notify endpoint (use dummy endpoints to avoid hitting production)
@@ -304,7 +304,7 @@ - (void)testNotifyEndpoint {
 }
 
 - (void)testSetEndpoints {
-    BugsnagConfiguration *config = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1 error:nil];
+    BugsnagConfiguration *config = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1];
     [config setEndpointsForNotify:@"http://notify.example.com" sessions:@"http://sessions.example.com"];
     XCTAssertEqualObjects([NSURL URLWithString:@"http://notify.example.com"], config.notifyURL);
     XCTAssertEqualObjects([NSURL URLWithString:@"http://sessions.example.com"], config.sessionURL);
@@ -312,7 +312,7 @@ - (void)testSetEndpoints {
 
 // in debug these throw exceptions though in release are "tolerated"
 - (void)testSetNilNotifyEndpoint {
-    BugsnagConfiguration *config = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1 error:nil];
+    BugsnagConfiguration *config = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1];
     NSString *notify = @"foo";
     notify = nil;
 #if DEBUG
@@ -325,7 +325,7 @@ - (void)testSetNilNotifyEndpoint {
 
 // in debug these throw exceptions though in release are "tolerated"
 - (void)testSetEmptyNotifyEndpoint {
-    BugsnagConfiguration *config = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1 error:nil];
+    BugsnagConfiguration *config = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1];
 #if DEBUG
     XCTAssertThrowsSpecificNamed([config setEndpointsForNotify:@"" sessions:@"http://sessions.example.com"],
             NSException, NSInternalInconsistencyException);
@@ -336,7 +336,7 @@ - (void)testSetEmptyNotifyEndpoint {
 
 // in debug these throw exceptions though in release are "tolerated"
 - (void)testSetMalformedNotifyEndpoint {
-    BugsnagConfiguration *config = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1 error:nil];
+    BugsnagConfiguration *config = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1];
 #if DEBUG
     XCTAssertThrowsSpecificNamed([config setEndpointsForNotify:@"http://" sessions:@"http://sessions.example.com"],
             NSException, NSInternalInconsistencyException);
@@ -371,7 +371,7 @@ - (void)testUserPersistence {
     NSString *name   = @"foo";
     NSString *userId = @"123";
     
-    BugsnagConfiguration *config = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1 error:nil];
+    BugsnagConfiguration *config = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1];
     
     // Check property defaults to True
     XCTAssertTrue(config.persistUser);
@@ -391,7 +391,7 @@ - (void)testUserPersistence {
 //    XCTAssertEqualObjects([bsg_SSKeychain passwordForService:kBugsnagUserUserId account:kBugsnagUserKeychainAccount], userId);
     
     // Check persistence between invocations (when values have been set)
-    BugsnagConfiguration *config2 = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1 error:nil];
+    BugsnagConfiguration *config2 = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1];
     
 //    XCTAssertEqualObjects(config2.currentUser.emailAddress, email);
 //    XCTAssertTrue([config2.currentUser.name isEqualToString:name]);
@@ -408,7 +408,7 @@ - (void)testUserPersistence {
  * Test that user data is (as far as we can tell) not persisted
  */
 - (void)testUserNonPesistence {
-    BugsnagConfiguration *config = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1 error:nil];
+    BugsnagConfiguration *config = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1];
     config.persistUser = false;
     [config deletePersistedUserData];
     
@@ -417,7 +417,7 @@ - (void)testUserNonPesistence {
 //    XCTAssertNil([bsg_SSKeychain passwordForService:kBugsnagUserName account:kBugsnagUserKeychainAccount]);
 //    XCTAssertNil([bsg_SSKeychain passwordForService:kBugsnagUserUserId account:kBugsnagUserKeychainAccount]);
 
-    BugsnagConfiguration *config2 = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1 error:nil];
+    BugsnagConfiguration *config2 = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1];
     XCTAssertNil(config2.currentUser);
 }
 
@@ -429,7 +429,7 @@ - (void)testPartialPesistence {
     NSString *name   = @"foo";
     NSString *userId = @"123";
     
-    BugsnagConfiguration *config = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1 error:nil];
+    BugsnagConfiguration *config = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1];
     XCTAssertTrue(config.persistUser);
     [config deletePersistedUserData];
 
@@ -457,7 +457,7 @@ - (void)testPartialPesistence {
  * Test that persisting a BugsnagUser with all nil fields behaves as expected
  */
 - (void)testAllUserDataNilPersistence {
-    BugsnagConfiguration *config = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1 error:nil];
+    BugsnagConfiguration *config = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1];
     XCTAssertTrue(config.persistUser);
     [config deletePersistedUserData];
 
@@ -480,7 +480,7 @@ - (void)testUserPersistenceAndMetadata {
     NSString *name   = @"foo";
     NSString *userId = @"123";
     
-    BugsnagConfiguration *config = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1 error:nil];
+    BugsnagConfiguration *config = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1];
     XCTAssertTrue(config.persistUser);
     [config deletePersistedUserData];
 
@@ -494,7 +494,7 @@ - (void)testUserPersistenceAndMetadata {
 
     // Check that retrieving persisted user data also sets configuration metadata
     // Check persistence between invocations (when values have been set)
-//    BugsnagConfiguration *config2 = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1 error:nil];
+//    BugsnagConfiguration *config2 = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1];
 //    XCTAssertTrue([config2.currentUser.emailAddress isEqualToString:email]);
 //    XCTAssertTrue([config2.currentUser.name isEqualToString:name]);
 //    XCTAssertTrue([config2.currentUser.userId isEqualToString:userId]);
@@ -513,12 +513,12 @@ - (void)testNonPersistenceAndMetadata {
     NSString *name   = @"foo";
     NSString *userId = @"123";
     
-    BugsnagConfiguration *config = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1 error:nil];
+    BugsnagConfiguration *config = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1];
     XCTAssertTrue(config.persistUser);
     [config setPersistUser:false];
     [config deletePersistedUserData];
     
-    BugsnagConfiguration *config2 = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1 error:nil];
+    BugsnagConfiguration *config2 = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1];
 //    XCTAssertNil([[config2 metadata] getMetadata:BSGKeyUser key:BSGKeyId]);
 //    XCTAssertNil([[config2 metadata] getMetadata:BSGKeyUser key:BSGKeyName]);
 //    XCTAssertNil([[config2 metadata] getMetadata:BSGKeyUser key:BSGKeyEmail]);
@@ -530,7 +530,7 @@ - (void)testNonPersistenceAndMetadata {
 }
 
 - (void)testSettingPersistUser {
-    BugsnagConfiguration *config = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1 error:nil];
+    BugsnagConfiguration *config = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1];
     XCTAssertTrue(config.persistUser);
     [config setPersistUser:false];
     XCTAssertFalse(config.persistUser);
@@ -546,39 +546,21 @@ - (void)testSettingPersistUser {
  * Test correct population of an NSError in the case of an invalid apiKey
  */
 -(void)testDesignatedInitializerInvalidApiKey {
-    NSError *error;
-    BugsnagConfiguration *invalidApiConfig = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_16CHAR error:&error];
-    XCTAssertNil(invalidApiConfig);
-    XCTAssertNotNil(error);
-    XCTAssertEqual([error domain], BSGConfigurationErrorDomain);
-    XCTAssertEqual([error code], BSGConfigurationErrorInvalidApiKey);
-    
-    XCTAssertTrue([[error domain] isEqualToString:@"com.Bugsnag.CocoaNotifier.Configuration"]);
-    XCTAssertEqual([error code], 0);
-
-// As per the docs the behaviour varies by platform
-//     https://developer.apple.com/documentation/foundation/nserror/1411580-userinfo?language=objc
-#if TARGET_OS_MAC
-    XCTAssertTrue([[error userInfo] isKindOfClass:[NSDictionary class]]);
-    XCTAssertEqual([(NSDictionary *)[error userInfo] count], 1);
-#else
-    XCTAssertNil([error userInfo]);
-#endif
+    BugsnagConfiguration *invalidApiConfig = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_16CHAR];
+    XCTAssertNotNil(invalidApiConfig);
+    XCTAssertEqualObjects(invalidApiConfig.apiKey, DUMMY_APIKEY_16CHAR);
 }
 
 /**
 * Test NSError is not populated in the case of a valid apiKey
 */
 -(void)testDesignatedInitializerValidApiKey {
-    NSError *error;
-    BugsnagConfiguration *validApiConfig1 = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1 error:&error];
+    BugsnagConfiguration *validApiConfig1 = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1];
     XCTAssertNotNil(validApiConfig1);
-    XCTAssertNil(error);
     XCTAssertEqual([validApiConfig1 apiKey], DUMMY_APIKEY_32CHAR_1);
     
-    BugsnagConfiguration *validApiConfig2 = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_2 error:nil];
+    BugsnagConfiguration *validApiConfig2 = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_2];
     XCTAssertNotNil(validApiConfig2);
-    XCTAssertNil(error);
     XCTAssertEqual([validApiConfig2 apiKey], DUMMY_APIKEY_32CHAR_2);
 }
 
@@ -598,7 +580,7 @@ -(void)testUnavailableConvenienceInitializer {
 }
 
 - (void)testDefaultReportOOMs {
-    BugsnagConfiguration *config = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1 error:nil];
+    BugsnagConfiguration *config = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1];
 #if DEBUG
     XCTAssertFalse([config enabledErrorTypes] & BSGErrorTypesOOMs);
 #else
@@ -607,7 +589,7 @@ - (void)testDefaultReportOOMs {
 }
 
 - (void)testErrorApiHeaders {
-    BugsnagConfiguration *config = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1 error:nil];
+    BugsnagConfiguration *config = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1];
     NSDictionary *headers = [config errorApiHeaders];
     XCTAssertEqualObjects(config.apiKey, headers[@"Bugsnag-Api-Key"]);
     XCTAssertNotNil(headers[@"Bugsnag-Sent-At"]);
@@ -615,7 +597,7 @@ - (void)testErrorApiHeaders {
 }
 
 - (void)testUser {
-    BugsnagConfiguration *config = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1 error:nil];
+    BugsnagConfiguration *config = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1];
     
     [config setUser:@"123" withName:@"foo" andEmail:@"test@example.com"];
     
@@ -625,7 +607,7 @@ - (void)testUser {
 }
 
 - (void)testApiKeySetter {
-    BugsnagConfiguration *config = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1 error:nil];
+    BugsnagConfiguration *config = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1];
     XCTAssertTrue([config.apiKey isEqualToString:DUMMY_APIKEY_32CHAR_1]);
     config.apiKey = DUMMY_APIKEY_32CHAR_1;
     XCTAssertEqual(DUMMY_APIKEY_32CHAR_1, config.apiKey);
@@ -642,7 +624,7 @@ - (void)testApiKeySetter {
 }
 
 - (void)testHasValidApiKey {
-    BugsnagConfiguration *config = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1 error:nil];
+    BugsnagConfiguration *config = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1];
 
     XCTAssertThrows(config.apiKey = DUMMY_APIKEY_16CHAR);
     XCTAssertTrue([config.apiKey isEqualToString:DUMMY_APIKEY_32CHAR_1]);
@@ -652,7 +634,7 @@ - (void)testHasValidApiKey {
 }
 
 -(void)testBSGErrorTypes {
-    BugsnagConfiguration *config = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1 error:nil];
+    BugsnagConfiguration *config = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1];
     
     // Test all are set by default
     BSGErrorType enabledErrors = BSGErrorTypesNSExceptions
@@ -675,7 +657,7 @@ -(void)testBSGErrorTypes {
  * Test the mapping between BSGErrorTypes and KSCrashTypes
  */
 -(void)testCrashTypeMapping {
-    BugsnagConfiguration *config = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1 error:nil];
+    BugsnagConfiguration *config = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1];
     BugsnagCrashSentry *sentry = [BugsnagCrashSentry new];
     BSG_KSCrashType crashTypes = BSG_KSCrashTypeNSException
                                | BSG_KSCrashTypeMachException
@@ -709,8 +691,7 @@ -(void)testCrashTypeMapping {
  */
 - (void) testRemoveOnSendBlock {
     // Prevent sending events
-    NSError *error;
-    BugsnagConfiguration *configuration = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1 error:&error];
+    BugsnagConfiguration *configuration = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1];
     XCTAssertEqual([[configuration onSendBlocks] count], 0);
     
     BugsnagOnSendBlock block = ^bool(BugsnagEvent * _Nonnull event) { return false; };
@@ -729,8 +710,7 @@ - (void) testRemoveOnSendBlock {
  */
 - (void) testClearOnSendBlock {
     // Prevent sending events
-    NSError *error;
-    BugsnagConfiguration *configuration = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1 error:&error];
+    BugsnagConfiguration *configuration = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1];
     XCTAssertEqual([[configuration onSendBlocks] count], 0);
     
     BugsnagOnSendBlock block1 = ^bool(BugsnagEvent * _Nonnull event) { return false; };
diff --git a/Tests/BugsnagEventTests.m b/Tests/BugsnagEventTests.m
index e851ed29a..f9a2713ca 100644
--- a/Tests/BugsnagEventTests.m
+++ b/Tests/BugsnagEventTests.m
@@ -27,7 +27,7 @@ @interface BugsnagEventTests : BugsnagBaseUnitTest
 @implementation BugsnagEventTests
 
 - (void)testNotifyReleaseStagesSendsFromConfig {
-    BugsnagConfiguration *config = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1 error:nil];
+    BugsnagConfiguration *config = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1];
     config.notifyReleaseStages = @[ @"foo" ];
     config.releaseStage = @"foo";
     BugsnagHandledState *state =
@@ -43,7 +43,7 @@ - (void)testNotifyReleaseStagesSendsFromConfig {
 }
 
 - (void)testNotifyReleaseStagesSkipsSendFromConfig {
-    BugsnagConfiguration *config = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1 error:nil];
+    BugsnagConfiguration *config = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1];
     config.notifyReleaseStages = @[ @"foo", @"bar" ];
     config.releaseStage = @"not foo or bar";
 
@@ -60,7 +60,7 @@ - (void)testNotifyReleaseStagesSkipsSendFromConfig {
 }
 
 - (void)testSessionJson {
-    BugsnagConfiguration *config = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1 error:nil];
+    BugsnagConfiguration *config = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1];
 
     BugsnagHandledState *state =
         [BugsnagHandledState handledStateWithSeverityReason:HandledException];
diff --git a/Tests/BugsnagPluginTest.m b/Tests/BugsnagPluginTest.m
index 375a090a5..b9860cbbc 100644
--- a/Tests/BugsnagPluginTest.m
+++ b/Tests/BugsnagPluginTest.m
@@ -45,7 +45,7 @@ @implementation BugsnagPluginTest
 
 - (void)testAddPlugin {
     id<BugsnagPlugin> plugin = [FakePlugin new];
-    BugsnagConfiguration *config = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1 error:nil];
+    BugsnagConfiguration *config = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1];
     [config addPlugin:plugin];
     XCTAssertEqual([config.plugins anyObject], plugin);
 }
@@ -55,7 +55,7 @@ - (void)testPluginLoaded {
     __block XCTestExpectation *expectation = [self expectationWithDescription:@"Plugin Loaded by Bugsnag"];
     plugin.expectation = expectation;
 
-    BugsnagConfiguration *config = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1 error:nil];
+    BugsnagConfiguration *config = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1];
     [config addPlugin:plugin];
     [Bugsnag startBugsnagWithConfiguration:config];
     [self waitForExpectations:@[expectation] timeout:3.0];
@@ -67,7 +67,7 @@ - (void)testCrashyPluginDoesNotCrashApp {
     CrashyPlugin *plugin = [CrashyPlugin new];
     plugin.expectation = expectation;
 
-    BugsnagConfiguration *config = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1 error:nil];
+    BugsnagConfiguration *config = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1];
     [config addPlugin:plugin];
     [Bugsnag startBugsnagWithConfiguration:config];
     [self waitForExpectations:@[expectation] timeout:3.0];
diff --git a/Tests/BugsnagSessionTrackerStopTest.m b/Tests/BugsnagSessionTrackerStopTest.m
index 73806bc99..31cbe940b 100644
--- a/Tests/BugsnagSessionTrackerStopTest.m
+++ b/Tests/BugsnagSessionTrackerStopTest.m
@@ -19,7 +19,7 @@ @implementation BugsnagSessionTrackerStopTest
 
 - (void)setUp {
     [super setUp];
-    self.configuration = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1 error:nil];
+    self.configuration = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1];
     self.configuration.autoTrackSessions = NO;
     self.tracker = [[BugsnagSessionTracker alloc] initWithConfig:self.configuration postRecordCallback:nil];
 }
diff --git a/Tests/BugsnagSessionTrackerTest.m b/Tests/BugsnagSessionTrackerTest.m
index 1bd383416..a0deef191 100644
--- a/Tests/BugsnagSessionTrackerTest.m
+++ b/Tests/BugsnagSessionTrackerTest.m
@@ -28,7 +28,7 @@ @implementation BugsnagSessionTrackerTest
 
 - (void)setUp {
     [super setUp];
-    self.configuration = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1 error:nil];
+    self.configuration = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1];
     [self.configuration deletePersistedUserData];
     self.sessionTracker = [[BugsnagSessionTracker alloc] initWithConfig:self.configuration
                                                      postRecordCallback:nil];
diff --git a/Tests/BugsnagSinkTests.m b/Tests/BugsnagSinkTests.m
index 99a8c3693..d7b69634a 100644
--- a/Tests/BugsnagSinkTests.m
+++ b/Tests/BugsnagSinkTests.m
@@ -36,7 +36,7 @@ - (void)setUp {
     self.rawReportData = [NSJSONSerialization JSONObjectWithData:contentData
                                                          options:0
                                                            error:nil];
-    BugsnagConfiguration *config = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1 error:nil];
+    BugsnagConfiguration *config = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1];
     config.autoDetectErrors = NO;
     // This value should not appear in the assertions, as it is not equal to
     // the release stage in the serialized report
@@ -319,7 +319,7 @@ - (NSDictionary *)reportFromHandledState:(BugsnagHandledState *)state {
     BugsnagEvent *report =
     [[BugsnagEvent alloc] initWithErrorName:@"TestError"
                                      errorMessage:@"Error for testing"
-                                    configuration:[[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1 error:nil]
+                                    configuration:[[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1]
                                          metadata:[NSDictionary new]
                                      handledState:state
                                           session:nil];
@@ -402,7 +402,7 @@ - (void)testCallbackSpecified {
     BugsnagEvent *report =
     [[BugsnagEvent alloc] initWithErrorName:@"TestError"
                                      errorMessage:@"Error for testing"
-                                    configuration:[[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1 error:nil]
+                                    configuration:[[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1]
                                          metadata:[NSDictionary new]
                                      handledState:state
                                           session:nil];
diff --git a/Tests/BugsnagTests.m b/Tests/BugsnagTests.m
index b5f79b009..5abc37652 100644
--- a/Tests/BugsnagTests.m
+++ b/Tests/BugsnagTests.m
@@ -30,8 +30,7 @@ @implementation BugsnagTests
  * A boilerplate helper method to setup Bugsnag
  */
 -(void)setUpBugsnagWillCallNotify:(bool)willNotify {
-    NSError *error;
-    BugsnagConfiguration *configuration = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1 error:&error];
+    BugsnagConfiguration *configuration = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1];
     if (willNotify) {
         [configuration addOnSendBlock:^bool(BugsnagEvent * _Nonnull event) { return false; }];
     }
@@ -125,8 +124,7 @@ - (void)testGetMetadata {
  *       or mocking is required to isolate and test the session pausing semantics.
  */
 -(void)testBugsnagPauseSession {
-    NSError *error;
-    BugsnagConfiguration *configuration = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1 error:&error];
+    BugsnagConfiguration *configuration = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1];
     [configuration addOnSendBlock:^bool(BugsnagEvent * _Nonnull event) { return false; }];
 
     [Bugsnag startBugsnagWithConfiguration:configuration];
@@ -142,8 +140,7 @@ - (void)testMutableContext {
     // Allow for checks inside blocks that may (potentially) be run asynchronously
     __block XCTestExpectation *expectation1 = [self expectationWithDescription:@"Localized metadata changes"];
     
-    NSError *error;
-    BugsnagConfiguration *configuration = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1 error:&error];
+    BugsnagConfiguration *configuration = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1];
     [configuration setContext:@"firstContext"];
     [configuration addOnSendBlock:^bool(BugsnagEvent * _Nonnull event) { return false; }];
     
@@ -225,8 +222,7 @@ - (void)testRemoveOnSessionBlock {
     __block XCTestExpectation *expectation2 = [self expectationWithDescription:@"Remove On Session Block 2"];
     expectation2.inverted = YES;
     
-    NSError *error;
-    BugsnagConfiguration *configuration = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1 error:&error];
+    BugsnagConfiguration *configuration = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1];
 
     // non-sending bugsnag
     [configuration addOnSendBlock:^bool(BugsnagEvent * _Nonnull event) { return false; }];
@@ -262,8 +258,7 @@ - (void)testAddOnSessionBlock {
     __block XCTestExpectation *expectation2 = [self expectationWithDescription:@"Remove On Session Block 3X"];
     expectation2.inverted = YES;
     
-    NSError *error;
-    BugsnagConfiguration *configuration = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1 error:&error];
+    BugsnagConfiguration *configuration = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1];
     configuration.autoTrackSessions = NO;
     
     // non-sending bugsnag
@@ -308,8 +303,7 @@ - (void) testOnSendBlocks {
     __block int called = 0; // A counter
     
     // Prevent sending events
-    NSError *error;
-    BugsnagConfiguration *configuration = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1 error:&error];
+    BugsnagConfiguration *configuration = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1];
     // We'll not be able to use the onSend -> false route to fail calls to notify()
     [configuration setEndpointsForNotify:@"http://not.valid.bugsnag/not/an/endpoint"
                                 sessions:@"http://not.valid.bugsnag/not/an/endpoint"];
diff --git a/UPGRADING.md b/UPGRADING.md
index 71825f1cb..ceb34d91c 100644
--- a/UPGRADING.md
+++ b/UPGRADING.md
@@ -8,17 +8,14 @@ Guide to ease migrations between significant changes
 
 #### Instantiation
 
-Initializing a configuration now requires a valid API key, setting an error
-parameter if initialization fails. In Swift, creating a configuration is now
-handled via the `try` mechanism.
+Initializing a configuration requires a valid API key.
 
 ```objc
 NSError *error;
-BugsnagConfiguration *config = [[BugsnagConfiguration alloc] initWithApiKey:@"YOUR API KEY HERE"
-                                                                      error:&error];
+BugsnagConfiguration *config = [[BugsnagConfiguration alloc] initWithApiKey:@"YOUR API KEY HERE"];
 ```
 ```swift
-  let config = try BugsnagConfiguration("YOUR API KEY HERE")
+  let config = BugsnagConfiguration("YOUR API KEY HERE")
 ```
 
 The exact error is available using the `BSGConfigurationErrorDomain` and
diff --git a/features/fixtures/ios-swift-cocoapods/iOSTestApp/AppDelegate.swift b/features/fixtures/ios-swift-cocoapods/iOSTestApp/AppDelegate.swift
index c2aa83263..f3e0662a0 100644
--- a/features/fixtures/ios-swift-cocoapods/iOSTestApp/AppDelegate.swift
+++ b/features/fixtures/ios-swift-cocoapods/iOSTestApp/AppDelegate.swift
@@ -47,20 +47,13 @@ class AppDelegate: UIResponder, UIApplicationDelegate {
     }
 
     internal func prepareConfig(apiKey: String, mockAPIPath: String) -> BugsnagConfiguration {
-        do {
-            if let config = try BugsnagConfiguration(apiKey) {
-                // Enabling by default to check not only the OOM reporting tests but
-                // also that extra reports aren't erroneously sent in other conditions
-                // when OOM reporting is enabled
-                config.enabledErrorTypes.insert(.OOMs)
-                config.setEndpoints(notify: mockAPIPath, sessions: mockAPIPath)
-                return config
-            }
-        }
-        catch {
-            assert(false)
-        }
-        fatalError("Unable to create BugsnagConfiguration")
+        let config = BugsnagConfiguration(apiKey)
+        // Enabling by default to check not only the OOM reporting tests but
+        // also that extra reports aren't erroneously sent in other conditions
+        // when OOM reporting is enabled
+        config.enabledErrorTypes.insert(.OOMs)
+        config.setEndpoints(notify: mockAPIPath, sessions: mockAPIPath)
+        return config
     }
 
     func triggerEvent(scenario: Scenario, delay: TimeInterval, mode: String) {
diff --git a/iOS/Bugsnag.xcodeproj/project.pbxproj b/iOS/Bugsnag.xcodeproj/project.pbxproj
index dab34d044..3a798573e 100644
--- a/iOS/Bugsnag.xcodeproj/project.pbxproj
+++ b/iOS/Bugsnag.xcodeproj/project.pbxproj
@@ -7,7 +7,6 @@
 	objects = {
 
 /* Begin PBXBuildFile section */
-		000DF29423DB4B4900A883CE /* TestConstants.m in Sources */ = {isa = PBXBuildFile; fileRef = 000DF29323DB4B4900A883CE /* TestConstants.m */; };
 		000E6E9E23D8690F009D8194 /* BugsnagSwiftConfigurationTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 000E6E9D23D8690F009D8194 /* BugsnagSwiftConfigurationTests.swift */; };
 		000E6EA323D8AC8C009D8194 /* UPGRADING.md in Resources */ = {isa = PBXBuildFile; fileRef = 000E6E9F23D8AC8C009D8194 /* UPGRADING.md */; };
 		000E6EA423D8AC8C009D8194 /* README.md in Resources */ = {isa = PBXBuildFile; fileRef = 000E6EA023D8AC8C009D8194 /* README.md */; };
@@ -420,7 +419,6 @@
 /* End PBXCopyFilesBuildPhase section */
 
 /* Begin PBXFileReference section */
-		000DF29323DB4B4900A883CE /* TestConstants.m */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.objc; path = TestConstants.m; sourceTree = "<group>"; };
 		000E6E9B23D84DB1009D8194 /* BugsnagTestConstants.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; name = BugsnagTestConstants.h; path = ../../Tests/BugsnagTestConstants.h; sourceTree = "<group>"; };
 		000E6E9C23D8690E009D8194 /* Tests-Bridging-Header.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = "Tests-Bridging-Header.h"; sourceTree = "<group>"; };
 		000E6E9D23D8690F009D8194 /* BugsnagSwiftConfigurationTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = BugsnagSwiftConfigurationTests.swift; sourceTree = "<group>"; };
@@ -807,7 +805,6 @@
 				8A2C8F951C6BC08600846019 /* report.json */,
 				000DF29223DB4A6B00A883CE /* Swift Tests */,
 				E70EE0891FD7047D00FA745C /* KSCrash */,
-				000DF29323DB4B4900A883CE /* TestConstants.m */,
 				00D7ACAC23E9C63000FBE4A7 /* BugsnagTests.m */,
 				00F9393723FC4F63008C7073 /* BugsnagTestsDummyClass.h */,
 				00F9393823FC4F64008C7073 /* BugsnagTestsDummyClass.m */,
@@ -1320,7 +1317,6 @@
 				E733A76F1FD709B7003EAA29 /* KSCrashReportStore_Tests.m in Sources */,
 				E70EE0781FD7039E00FA745C /* RFC3339DateTool_Tests.m in Sources */,
 				8A530CC422FDD51F00F0C108 /* KSCrashIdentifierTests.m in Sources */,
-				000DF29423DB4B4900A883CE /* TestConstants.m in Sources */,
 				8A4E733F1DC13281001F7CC8 /* BugsnagConfigurationTests.m in Sources */,
 				E784D25A1FD70C25004B01E1 /* KSJSONCodec_Tests.m in Sources */,
 				009131BC23F46279000810D9 /* BugsnagMetadataTests.m in Sources */,
diff --git a/iOS/BugsnagTests/BSGOutOfMemoryWatchdogTests.m b/iOS/BugsnagTests/BSGOutOfMemoryWatchdogTests.m
index 7233229e4..afe9f57e6 100644
--- a/iOS/BugsnagTests/BSGOutOfMemoryWatchdogTests.m
+++ b/iOS/BugsnagTests/BSGOutOfMemoryWatchdogTests.m
@@ -28,7 +28,7 @@ @implementation BSGOutOfMemoryWatchdogTests
 
 - (void)setUp {
     [super setUp];
-    BugsnagConfiguration *config = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1 error: nil];
+    BugsnagConfiguration *config = [[BugsnagConfiguration alloc] initWithApiKey:DUMMY_APIKEY_32CHAR_1];
     config.autoDetectErrors = NO;
     config.codeBundleId = @"codeBundleIdHere";
     config.releaseStage = @"MagicalTestingTime";
diff --git a/iOS/BugsnagTests/Swift Tests/BugsnagSwiftConfigurationTests.swift b/iOS/BugsnagTests/Swift Tests/BugsnagSwiftConfigurationTests.swift
index eeb0f7f26..634ded092 100644
--- a/iOS/BugsnagTests/Swift Tests/BugsnagSwiftConfigurationTests.swift	
+++ b/iOS/BugsnagTests/Swift Tests/BugsnagSwiftConfigurationTests.swift	
@@ -16,22 +16,7 @@ class BugsnagSwiftConfigurationTests: XCTestCase {
      * (read: longer) ObjC invocation).
      */
     func testDesignatedInitializerHasCorrectNS_SWIFT_NAME() {
-        
-        do {
-            let _ = try BugsnagConfiguration(DUMMY_APIKEY_16CHAR)
-            XCTFail("Erronoeusly initialized a BugsnagConfiguration object with an invalid apiKey")
-        }
-        catch let e as NSError {
-            XCTAssertEqual(e.domain, BSGConfigurationErrorDomain)
-            XCTAssertEqual(e.code, BSGConfigurationErrorCode.invalidApiKey.rawValue)
-        }
-        
-        do {
-            let config = try BugsnagConfiguration(DUMMY_APIKEY_32CHAR_1)
-            XCTAssertEqual(config?.apiKey, DUMMY_APIKEY_32CHAR_1)
-        }
-        catch let e as NSError {
-            XCTFail("Failed to initialize a BugsnagConfiguration object with a correct apiKey: \(e.domain), \(e.code)")
-        }
+        let config = BugsnagConfiguration(DUMMY_APIKEY_16CHAR)
+        XCTAssertEqual(config.apiKey, DUMMY_APIKEY_16CHAR)
     }
 }
diff --git a/iOS/BugsnagTests/Swift Tests/BugsnagSwiftTests.swift b/iOS/BugsnagTests/Swift Tests/BugsnagSwiftTests.swift
index 083b8eb2e..d470dd8f0 100644
--- a/iOS/BugsnagTests/Swift Tests/BugsnagSwiftTests.swift	
+++ b/iOS/BugsnagTests/Swift Tests/BugsnagSwiftTests.swift	
@@ -15,22 +15,16 @@ class BugsnagSwiftTests: XCTestCase {
      * Confirm that the addMetadata() method is exposed to Swift correctly
      */
     func testAddMetadataToSectionIsExposedToSwiftCorrectly() {
-        do {
-            if let configuration = try BugsnagConfiguration(DUMMY_APIKEY_32CHAR_1) {
-                Bugsnag.start(with: configuration)
-                Bugsnag.addMetadata("mySection1", key: "myKey1", value: "myValue1")
-                
-                let exception1 = NSException(name: NSExceptionName(rawValue: "exception1"), reason: "reason1", userInfo: nil)
-                
-                Bugsnag.notify(exception1) { (event) in
-                    // Arbitrary test, replicating the ObjC one
-                    let value = (event.metadata["mySection1"] as? [String : Any])?["myKey1"] as? String
-                    XCTAssertEqual(value, "myValue1")
-                }
-            }
-        }
-        catch let e as NSError {
-            XCTFail("Failed to check method Swift exposure: \(e.debugDescription)")
+        let configuration = BugsnagConfiguration(DUMMY_APIKEY_32CHAR_1)
+        Bugsnag.start(with: configuration)
+        Bugsnag.addMetadata("mySection1", key: "myKey1", value: "myValue1")
+        
+        let exception1 = NSException(name: NSExceptionName(rawValue: "exception1"), reason: "reason1", userInfo: nil)
+        
+        Bugsnag.notify(exception1) { (event) in
+            // Arbitrary test, replicating the ObjC one
+            let value = (event.metadata["mySection1"] as? [String : Any])?["myKey1"] as? String
+            XCTAssertEqual(value, "myValue1")
         }
     }
     
@@ -38,7 +32,7 @@ class BugsnagSwiftTests: XCTestCase {
      * Confirm that the clearMetadata() method is exposed to Swift correctly
      */
     func testClearMetadataInSectionIsExposedToSwiftCorrectly() {
-        try! Bugsnag.start(with: BugsnagConfiguration(DUMMY_APIKEY_32CHAR_1)!)
+        Bugsnag.start(with: BugsnagConfiguration(DUMMY_APIKEY_32CHAR_1))
         // We don't need to check method's functioning, only that we can call it this way
         Bugsnag.clearMetadata(section: "testSection")
    }
diff --git a/iOS/BugsnagTests/TestConstants.m b/iOS/BugsnagTests/TestConstants.m
deleted file mode 100644
index ab3c4889f..000000000
--- a/iOS/BugsnagTests/TestConstants.m
+++ /dev/null
@@ -1,23 +0,0 @@
-//
-//  TestConstants.m
-//  Tests
-//
-//  Created by Robin Macharg on 24/01/2020.
-//  Copyright © 2020 Bugsnag. All rights reserved.
-//
-
-#import <XCTest/XCTest.h>
-#import "BugsnagConfiguration.h"
-
-@interface TestConstants : XCTestCase
-
-@end
-
-@implementation TestConstants
-
-- (void)testConfigurationConstants {
-    XCTAssertTrue([BSGConfigurationErrorDomain isEqualToString:@"com.Bugsnag.CocoaNotifier.Configuration"]);
-    XCTAssertEqual(BSGConfigurationErrorInvalidApiKey, 0);
-}
-
-@end
diff --git a/tvOS/Bugsnag.xcodeproj/project.pbxproj b/tvOS/Bugsnag.xcodeproj/project.pbxproj
index 9d979e18b..9642d8604 100644
--- a/tvOS/Bugsnag.xcodeproj/project.pbxproj
+++ b/tvOS/Bugsnag.xcodeproj/project.pbxproj
@@ -16,7 +16,6 @@
 		00D7ACA023E97FBD00FBE4A7 /* BugsnagEvent.m in Sources */ = {isa = PBXBuildFile; fileRef = 00D7AC9E23E97FBD00FBE4A7 /* BugsnagEvent.m */; };
 		00D7ACA123E97FBD00FBE4A7 /* BugsnagEvent.h in Headers */ = {isa = PBXBuildFile; fileRef = 00D7AC9F23E97FBD00FBE4A7 /* BugsnagEvent.h */; settings = {ATTRIBUTES = (Public, ); }; };
 		00D7ACA723E98A5D00FBE4A7 /* BugsnagEventTests.m in Sources */ = {isa = PBXBuildFile; fileRef = 00D7ACA623E98A5D00FBE4A7 /* BugsnagEventTests.m */; };
-		00D7ACAA23E98A9A00FBE4A7 /* TestConstants.m in Sources */ = {isa = PBXBuildFile; fileRef = 00D7ACA823E98A9A00FBE4A7 /* TestConstants.m */; };
 		00D7ACAB23E98A9A00FBE4A7 /* BugsnagEventFromKSCrashReportTest.m in Sources */ = {isa = PBXBuildFile; fileRef = 00D7ACA923E98A9A00FBE4A7 /* BugsnagEventFromKSCrashReportTest.m */; };
 		00F9393623FC16DA008C7073 /* BugsnagBaseUnitTest.m in Sources */ = {isa = PBXBuildFile; fileRef = 00F9393523FC16DA008C7073 /* BugsnagBaseUnitTest.m */; };
 		00F9393F23FD2DDB008C7073 /* BugsnagTestsDummyClass.m in Sources */ = {isa = PBXBuildFile; fileRef = 00F9393E23FD2DDB008C7073 /* BugsnagTestsDummyClass.m */; };
@@ -1012,7 +1011,6 @@
 				E7CE79021FD94F1B001D07E0 /* RFC3339DateTool_Tests.m in Sources */,
 				4B3CD2BE22C5676800DBFF33 /* RegisterErrorDataTest.m in Sources */,
 				E7CE78F91FD94F1B001D07E0 /* KSSystemInfo_Tests.m in Sources */,
-				00D7ACAA23E98A9A00FBE4A7 /* TestConstants.m in Sources */,
 				4B3CD2BB22C5676800DBFF33 /* BSGOutOfMemoryWatchdogTests.m in Sources */,
 				E7CE78F41FD94F1B001D07E0 /* KSFileUtils_Tests.m in Sources */,
 				00F9393F23FD2DDB008C7073 /* BugsnagTestsDummyClass.m in Sources */,