DioError [DioErrorType.other]: Invalid argument(s) (onError): The error handler of Future.catchError must return a value of the future's type

[JanKokalj]

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Issue Info

Info	Value
Platform Name	Android
Platform Version	10.0
Dio Version	4.0.4
Android Studio / Xcode Version	IntelliJ 2021.3.2
Repro rate	Hard to reproduce

Issue Description and Steps

This is hard to reproduce. It happens when our app is in the foreground and you lock the screen of the device, then after about half an hour later, you unlock the device (we fetch new data), and then this exception happens (the same request and all other requests are working in other scenarios/times). I could not find anything related to this on the internet so I am opening an issue here to get some more insights. The stack traces are:

Non-fatal Exception: io.flutter.plugins.firebase.crashlytics.FlutterError: DioError [DioErrorType.other]: Invalid argument(s) (onError): The error handler of Future.catchError must return a value of the future's type
#0      _FutureListener.handleError (dart:async/future_impl.dart:194)
#1      Future._propagateToListeners.handleError (dart:async/future_impl.dart:779)
#2      Future._propagateToListeners (dart:async/future_impl.dart:800)
#3      Future._completeError (dart:async/future_impl.dart:610)
#4      Future._asyncCompleteError.<anonymous closure> (dart:async/future_impl.dart:666)
#5      _rootRun (dart:async/zone.dart:1428)
#6      _CustomZone.run (dart:async/zone.dart:1328)
#7      _CustomZone.runGuarded (dart:async/zone.dart:1236)
#8      _CustomZone.bindCallbackGuarded.<anonymous closure> (dart:async/zone.dart:1276)
#9      _microtaskLoop (dart:async/schedule_microtask.dart:40)
#10     _startMicrotaskLoop (dart:async/schedule_microtask.dart:49)

Source stack:
#0      DioMixin.fetch (package:dio/src/dio_mixin.dart:473)
#1      DioMixin.request (package:dio/src/dio_mixin.dart:468)
#2      DioMixin.get (package:dio/src/dio_mixin.dart:55)
#3      AuthenticatedHttpClientImpl.get.<anonymous closure> (package:/../layers/network/http_client/authenticated_http_client_impl.dart:93)

Relevant code:

late Dio _dioClient;

_dioClient = Dio();

_dioClient.get(
        uri.toString(),
        options: Options(
          extra: _createExtraMap(requiresAuthToken),
          responseType: ResponseType.plain,
          headers: headers,
        ),
      )