diff --git a/lib/models/config.ts b/lib/models/config.ts
index 108a35f..c99e5b3 100644
--- a/lib/models/config.ts
+++ b/lib/models/config.ts
@@ -7,7 +7,7 @@ export enum Platform {
     GITEA = "gitea",
     GITHUB = "github",
     GITLAB = "gitlab",
-    NULL = "",
+    NULL = "null",
 }
 
 /**
diff --git a/lib/verify-config.ts b/lib/verify-config.ts
index 6f2cbea..094c4d6 100644
--- a/lib/verify-config.ts
+++ b/lib/verify-config.ts
@@ -32,12 +32,12 @@ const validTargetsArray = (targets: Partial<Target>[]): boolean => targets.
 /**
  * validPlatform validates an input string platform.
  * 
- * @param stringPlatform the platform to validate.
+ * @param input the platform to validate.
  * 
  * @returns true if the input platform is valid.
  */
-const validPlatform = (stringPlatform: string): boolean => Boolean(Object.values(Platform).
-    find(platform => platform.toString() === stringPlatform))
+const validPlatform = (input: Platform): boolean => Boolean(Object.values(Platform).
+    find(platform => input === platform))
 
 /**
  * ensureDefaults takes as input a partial backmerge configuration, alongside environment variables 
@@ -73,7 +73,7 @@ export const verifyConfig = (config: BackmergeConfig): void => {
         commit: [isString, stringNotEmpty],
         debug: [isBoolean], // shouldn't happen since it comes from semantic-release config
         dryRun: [isBoolean], // shouldn't happen since it comes from semantic-release config
-        platform: [isString, validPlatform],
+        platform: [validPlatform],
         repositoryUrl: [isString, stringNotEmpty], // shouldn't happen since it comes from semantic-release config
         targets: [isArray, validTargetsArray],
         title: [isString, stringNotEmpty],
diff --git a/test/verify-config.test.ts b/test/verify-config.test.ts
index 7a14bf3..090d58d 100644
--- a/test/verify-config.test.ts
+++ b/test/verify-config.test.ts
@@ -186,20 +186,18 @@ describe("verifyConfig", () => {
         matcher.toThrowError(getConfigError("targets", targets).message)
     })
 
-    test("should throw an invalid platform with base url", () => {
+    test("should be fine with minimal inputs", () => {
         // Arrange
-        const config = ensureDefault({
-            baseUrl: "https://example.com",
-        }, { GITHUB_TOKEN: "some token" })
+        const config = ensureDefault({ repositoryUrl: "some repository url" }, { GITHUB_TOKEN: "some token" })
 
         // Act
         const matcher = expect(() => verifyConfig(config))
 
         // Assert
-        matcher.toThrowError(getConfigError("platform", "").message)
+        matcher.not.toThrowError()
     })
 
-    test("should be fine with base url", () => {
+    test("should be fine with some inputs", () => {
         // Arrange
         const config = ensureDefault({
             baseUrl: "https://example.com",