Crashlytics: Crash recording non-Flutter error

https://console.firebase.google.com/u/0/project/anglers-log/crashlytics/app/android:com.cohenadair.anglerslog/issues/8d87decb45e143f61a45f72a9966fa1d?time=7d&sessionEventKey=696CBB3F01D600060C2EC862FE4E50F1_2175098154379238221

```
Fatal Exception: io.flutter.plugins.firebase.crashlytics.FlutterError
type 'String' is not a subtype of type 'StackTrace?'
```