Error on home page when clicking on "help us"

[monsieurtanuki]

What

We get the following error when clicking on a "help us" button on the home page, and we cannot go back to the app:

E/flutter ( 3587): [ERROR:flutter/runtime/dart_vm_initializer.cc(41)] Unhandled Exception: GoError: There is nothing to pop
E/flutter ( 3587): #0      GoRouterDelegate.pop (package:go_router/src/delegate.dart:92:7)
E/flutter ( 3587): #1      GoRouter.pop (package:go_router/src/router.dart:491:20)
E/flutter ( 3587): #2      AppNavigator.pop (package:smooth_app/pages/navigator/app_navigator.dart:83:20)
E/flutter ( 3587): #3      _ExternalPageState.initState.<anonymous closure> (package:smooth_app/pages/navigator/external_page.dart:79:36)
E/flutter ( 3587): <asynchronous suspension>
E/flutter ( 3587):

Steps to reproduce the behavior

1. Restart the app
2. Stay on the scan page, and wait until the app news is loaded, potentially with a "help us" message
3. Click on the "help us" button
4. You land on a donation web page, fair enough
5. But meanwhile there's an error in the logs
6. Close the web page and you land on an empty screen instead of the app

Screenshot/Mockup/Before-After

home page	after closing the web page

The text of the "help us" message is ridiculously cropped, but that's another story.

[Edit] For the record the top scan buttons look like crap, but it's only because I haven't used the latest version.