diff --git a/aio/src/app/shared/reporting-error-handler.spec.ts b/aio/src/app/shared/reporting-error-handler.spec.ts
index 39fb790e30..941327b22f 100644
--- a/aio/src/app/shared/reporting-error-handler.spec.ts
+++ b/aio/src/app/shared/reporting-error-handler.spec.ts
@@ -56,10 +56,40 @@ describe('ReportingErrorHandler service', () => {
       expect(onerrorSpy).toHaveBeenCalledWith(error.message, undefined, undefined, undefined, error);
     });
 
+    it('should send a non-error object to window.onerror', () => {
+      const error = {reason: 'this is an error message'};
+      handler.handleError(error);
+      expect(onerrorSpy).toHaveBeenCalledWith(JSON.stringify(error));
+    });
+
+    it('should send a non-error object with circular references to window.onerror', () => {
+      const error = {
+        reason: 'this is an error message',
+        get self() { return this; },
+        toString() { return `{reason: ${this.reason}}`; },
+      };
+      handler.handleError(error);
+      expect(onerrorSpy).toHaveBeenCalledWith('{reason: this is an error message}');
+    });
+
     it('should send an error string to window.onerror', () => {
       const error = 'this is an error message';
       handler.handleError(error);
       expect(onerrorSpy).toHaveBeenCalledWith(error);
     });
+
+    it('should send a non-object, non-string error stringified to window.onerror', () => {
+      handler.handleError(404);
+      handler.handleError(false);
+      handler.handleError(null);
+      handler.handleError(undefined);
+
+      expect(onerrorSpy.calls.allArgs()).toEqual([
+        ['404'],
+        ['false'],
+        ['null'],
+        ['undefined'],
+      ]);
+    });
   });
 });
diff --git a/aio/src/app/shared/reporting-error-handler.ts b/aio/src/app/shared/reporting-error-handler.ts
index 126580f157..badb88bdff 100644
--- a/aio/src/app/shared/reporting-error-handler.ts
+++ b/aio/src/app/shared/reporting-error-handler.ts
@@ -17,8 +17,7 @@ export class ReportingErrorHandler extends ErrorHandler {
    * Send error info to Google Analytics, in addition to the default handling.
    * @param error Information about the error.
    */
-  handleError(error: string | Error) {
-
+  handleError(error: any) {
     try {
       super.handleError(error);
     } catch (e) {
@@ -27,12 +26,19 @@ export class ReportingErrorHandler extends ErrorHandler {
     this.reportError(error);
   }
 
-  private reportError(error: string | Error) {
+  private reportError(error: unknown) {
     if (this.window.onerror) {
-      if (typeof error === 'string') {
-        this.window.onerror(error);
-      } else {
+      if (error instanceof Error) {
         this.window.onerror(error.message, undefined, undefined, undefined, error);
+      } else {
+        if (typeof error === 'object') {
+          try {
+            error = JSON.stringify(error);
+          } catch {
+            // Ignore the error and just let it be stringified.
+          }
+        }
+        this.window.onerror(`${error}`);
       }
     }
   }
diff --git a/aio/src/index.html b/aio/src/index.html
index 2444bf4735..db945765a5 100644
--- a/aio/src/index.html
+++ b/aio/src/index.html
@@ -69,7 +69,7 @@
       function formatError(msg, url, line, col, e) {
         var stack;
         msg = msg.replace(/^Error: /, '');
-        if (e) {
+        if (e && e.stack) {
           stack = e.stack
             // strip the leading "Error: " from the stack trace
             .replace(/^Error: /, '')