Wherigo Analyzer: Toggling expert mode turns screen gray after getting LUA failed

[JanRei]

Affects: Wherigo Analyzer Version: 3.1.1 (270), web and iOS (version 17.5.1 on iPhone 12)

Steps:

1. Load a cartridge.
2. Make sure expert mode is activated.
3. Click on Get LUA and confirm dialog, but make the operation fail. On web view, getting the decompiled LUA code always fails for me, so this is easy to reproduce there. On iOS, I can reproduce the issue by putting the phone into airplane mode before clicking the button.
4. From drop-down menu select List of Characters.
5. Disable expert mode.
6. Try to open the drop-down menu.

Result: The whole screen turns gray and the app needs to be restarted.