Don’t report IE error for freed script in event and timeout handlers

plugins/errors.js

@@ -1017,7 +1017,15 @@
 					return fn.apply(that, arguments);
 				}
 				catch (e) {
-					// error during callback
+					// Check for IE/Edge error "Can't execute code from freed script"
+					if (e.number === -2146823277 &&
+						(via === BOOMR.plugins.Errors.VIA_EVENTHANDLER || via === BOOMR.plugins.Errors.VIA_TIMEOUT)) {
+						// Event listeners that reference freed scripts don't generate errors in IE
+						// Our call to a freed script does though, don't report the error
+						return;
+					}
+
+					// Report error during callback
 					impl.send(e, via);
 
 					// re-throw

tests/page-templates/14-errors/26-freed-events.html

@@ -0,0 +1,44 @@
+<%= header %>
+<%= boomerangScriptMin %>
+<script src="26-freed-events.js" type="text/javascript"></script>
+<iframe id="testFrame"></iframe>
+<script>
+var testFrame = document.getElementById("testFrame");
+var testFrameDoc = testFrame.contentWindow.document;
+testFrameDoc.open();
+testFrameDoc.write("\x3cscript\x3efuncInIframe \x3d function(event) { console.log(\x22hello from iframe\x22); }\x3c/script\x3e");
+testFrameDoc.close();
+
+BOOMR_test.init({
+	testAfterOnBeacon: 1,
+	Errors: {
+		enabled: true,
+		monitorEvents: true,
+		sendAfterOnload: true,
+
+		// turn off global so it doesn't get in the way
+		monitorGlobal: false,
+		monitorTimeout: false
+	}
+});
+
+if (window.addEventListener && window.postMessage) {
+	// by the time the message event callback is called the iframe would have been freed
+	// in IE/Edge this causes a `Can't execute code from freed script` error
+	// in Chrome, the callback will execute
+	window.addEventListener("message", testFrame.contentWindow.funcInIframe);
+
+	// changing the src causes the script to be freed in IE/Edge
+	testFrameDoc.open();
+	testFrameDoc.write("");
+	testFrameDoc.close();
+
+	setTimeout(function() {
+		window.postMessage("foo", "*");
+	}, 100);
+}
+</script>
+
+<!-- delay the page by 1second so an error can fire -->
+<img src="/delay?delay=1000&amp;file=/assets/img.jpg" style="width: 100px" />
+<%= footer %>

tests/page-templates/14-errors/26-freed-events.js

@@ -0,0 +1,24 @@
+/*eslint-env mocha*/
+/*global BOOMR_test,assert*/
+
+describe("e2e/14-errors/26-freed-events", function() {
+	var tf = BOOMR.plugins.TestFramework;
+	var t = BOOMR_test;
+
+	if (!window.addEventListener) {
+		it("Skipping on browser that doesn't support addEventListener", function() {
+		});
+
+		return;
+	}
+
+	it("Should have only sent a page-load beacon", function(done) {
+		this.timeout(10000);
+		t.ensureBeaconCount(done, 1);
+	});
+
+	it("Should have no error on the page-load beacon", function() {
+		var b = tf.lastBeacon();
+		assert.isUndefined(b.err);
+	});
+});

tests/page-templates/14-errors/27-freed-timeout.html

@@ -0,0 +1,38 @@
+<%= header %>
+<%= boomerangScriptMin %>
+<script src="27-freed-timeout.js" type="text/javascript"></script>
+<iframe id="testFrame"></iframe>
+<script>
+var testFrame = document.getElementById("testFrame");
+var testFrameDoc = testFrame.contentWindow.document;
+testFrameDoc.open();
+testFrameDoc.write("\x3cscript\x3efuncInIframe \x3d function(event) { console.log(\x22hello from iframe\x22); }\x3c/script\x3e");
+testFrameDoc.close();
+
+BOOMR_test.init({
+	testAfterOnBeacon: 1,
+	Errors: {
+		enabled: true,
+		monitorTimeout: true,
+		sendAfterOnload: true,
+
+		// turn off global so it doesn't get in the way
+		monitorGlobal: false,
+		monitorEvents: false
+	}
+});
+
+// by the time the setTimout callback is called the iframe would have been freed
+// in IE/Edge this causes a `Can't execute code from freed script` error
+// in Chrome, the callback will execute
+setTimeout(testFrame.contentWindow.funcInIframe, 100);
+
+// changing the src causes the script to be freed in IE/Edge
+testFrameDoc.open();
+testFrameDoc.write("");
+testFrameDoc.close();
+</script>
+
+<!-- delay the page by 1second so an error can fire -->
+<img src="/delay?delay=1000&amp;file=/assets/img.jpg" style="width: 100px" />
+<%= footer %>

tests/page-templates/14-errors/27-freed-timeout.js

@@ -0,0 +1,17 @@
+/*eslint-env mocha*/
+/*global BOOMR_test,assert*/
+
+describe("e2e/14-errors/27-freed-timeout", function() {
+	var tf = BOOMR.plugins.TestFramework;
+	var t = BOOMR_test;
+
+	it("Should have only sent a page-load beacon", function(done) {
+		this.timeout(10000);
+		t.ensureBeaconCount(done, 1);
+	});
+
+	it("Should have no error on the page-load beacon", function() {
+		var b = tf.lastBeacon();
+		assert.isUndefined(b.err);
+	});
+});