Bug 489045 - nsXULWindow::GetParentNativeWindow crashes if GetParentWidget returns null. r=roc

xpfe/appshell/src/nsXULWindow.cpp

@@ -742,8 +742,10 @@ NS_IMETHODIMP nsXULWindow::GetParentNativeWindow(nativeWindow* aParentNativeWind
   nsCOMPtr<nsIWidget> parentWidget;
   NS_ENSURE_SUCCESS(GetParentWidget(getter_AddRefs(parentWidget)), NS_ERROR_FAILURE);
 
-  *aParentNativeWindow = parentWidget->GetNativeData(NS_NATIVE_WIDGET);
-   
+  if (parentWidget) {
+    *aParentNativeWindow = parentWidget->GetNativeData(NS_NATIVE_WIDGET);
+  }
+
   return NS_OK;
 }