diff --git a/projects/ng-devtools-backend/src/lib/angular-check.ts b/projects/ng-devtools-backend/src/lib/angular-check.ts
index 9fdc078cd59..58febdad5a9 100644
--- a/projects/ng-devtools-backend/src/lib/angular-check.ts
+++ b/projects/ng-devtools-backend/src/lib/angular-check.ts
@@ -21,8 +21,16 @@ export const appIsSupportedAngularVersion = (): boolean => {
   return appIsAngular() && (major >= 9 || major === 0);
 };
 
+/**
+ * We check if the global `window.ng` is an object and if this object
+ * has the `getComponent` method attached to it. In some g3 apps processed
+ * with Closure, `ng` is a function, which means that `typeof ng !== 'undefined'`
+ * is not a sufficient check.
+ *
+ * @returns if the app has global ng debug object
+ */
 const appHasGlobalNgDebugObject = (): boolean => {
-  return typeof ng !== 'undefined';
+  return typeof ng === 'object' && typeof ng.getComponent === 'function';
 };
 
 export const getAngularVersion = (): string | null => {
diff --git a/projects/ng-devtools-backend/src/lib/client-event-subscribers.ts b/projects/ng-devtools-backend/src/lib/client-event-subscribers.ts
index d7755aecaf7..4bb56802c08 100644
--- a/projects/ng-devtools-backend/src/lib/client-event-subscribers.ts
+++ b/projects/ng-devtools-backend/src/lib/client-event-subscribers.ts
@@ -50,7 +50,7 @@ export const subscribeToClientEvents = (messageBus: MessageBus<Events>): void =>
     // Often websites have `scroll` event listener which triggers
     // Angular's change detection. We don't want to constantly send
     // update requests, instead we want to request an update at most
-    // every 250ms
+    // once every 250ms
     runOutsideAngular(() => {
       initializeOrGetDirectiveForestHooks()
         .profiler.changeDetection$.pipe(debounceTime(250))
diff --git a/projects/ng-devtools-backend/src/lib/utils.ts b/projects/ng-devtools-backend/src/lib/utils.ts
index 9d1e77e4fb0..7b0724b2087 100644
--- a/projects/ng-devtools-backend/src/lib/utils.ts
+++ b/projects/ng-devtools-backend/src/lib/utils.ts
@@ -8,7 +8,12 @@ export const runOutsideAngular = (f: () => any): void => {
     w.Zone.current.run(f);
     return;
   }
-  w.Zone.current._parent.run(f);
+  const parent = w.Zone.current._parent;
+  if (parent && parent.run) {
+    parent.run(f);
+    return;
+  }
+  f();
 };
 
 export const isCustomElement = (node: Node) => {