diff --git a/packages/core-api/src/apis/implementations/ErrorApi/UnhandledErrorForwarder.ts b/packages/core-api/src/apis/implementations/ErrorApi/UnhandledErrorForwarder.ts
new file mode 100644
index 0000000000..64fd556057
--- /dev/null
+++ b/packages/core-api/src/apis/implementations/ErrorApi/UnhandledErrorForwarder.ts
@@ -0,0 +1,37 @@
+import { ErrorApi } from '../../definitions';
+
+/*
+ * Copyright 2020 Spotify AB
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+export class UnhandledErrorForwarder {
+  static forward(errorApi: ErrorApi) {
+    window.addEventListener(
+      'unhandledrejection',
+      (e: PromiseRejectionEvent) => {
+        errorApi.post(
+          {
+            name: `Unhandled Rejection: ${e.reason.message}`,
+            message: e.reason.message,
+            stack: e.reason.stack,
+          },
+          { hidden: true },
+        );
+        // eslint-disable-next-line no-console
+        console.error(e.reason);
+        e.preventDefault();
+      },
+    );
+  }
+}
diff --git a/packages/core-api/src/apis/implementations/ErrorApi/index.ts b/packages/core-api/src/apis/implementations/ErrorApi/index.ts
index 757dfd0d8f..86b9b35b24 100644
--- a/packages/core-api/src/apis/implementations/ErrorApi/index.ts
+++ b/packages/core-api/src/apis/implementations/ErrorApi/index.ts
@@ -16,3 +16,4 @@
 
 export { ErrorAlerter } from './ErrorAlerter';
 export { ErrorApiForwarder } from './ErrorApiForwarder';
+export { UnhandledErrorForwarder } from './UnhandledErrorForwarder';
diff --git a/packages/core/src/api-wrappers/defaultApis.ts b/packages/core/src/api-wrappers/defaultApis.ts
index d044b50b7a..662b986e28 100644
--- a/packages/core/src/api-wrappers/defaultApis.ts
+++ b/packages/core/src/api-wrappers/defaultApis.ts
@@ -47,6 +47,7 @@ import {
   oneloginAuthApiRef,
   OneLoginAuth,
   oidcAuthApiRef,
+  UnhandledErrorForwarder,
 } from '@backstage/core-api';
 
 import OAuth2Icon from '@material-ui/icons/AcUnit';
@@ -64,8 +65,11 @@ export const defaultApis = [
   createApiFactory({
     api: errorApiRef,
     deps: { alertApi: alertApiRef },
-    factory: ({ alertApi }) =>
-      new ErrorAlerter(alertApi, new ErrorApiForwarder()),
+    factory: ({ alertApi }) => {
+      const errorApi = new ErrorAlerter(alertApi, new ErrorApiForwarder());
+      UnhandledErrorForwarder.forward(errorApi);
+      return errorApi;
+    },
   }),
   createApiFactory({
     api: storageApiRef,