fix: embedding Flutter App that uses riverpod fails

[nietsmmar]

Description

After removing matomo as dependency from my app to check if embedding works without it (see this issue) I got another error. Apparently it has to do with gorouter and riverpod. I set up a minimal reproducible example below.

Error

Uncaught Error from backend:

Error: Bad state: Not connected to an application.

Stack Trace:
#0      DevHandler._handleConnection.<anonymous closure> (package:dwds/src/handlers/dev_handler.dart:275:13)
#1      _rootRunUnary (dart:async/zone.dart:1546:13)
#2      _RootZone.runUnaryGuarded (dart:async/zone.dart:1781:7)
#3      _BufferingStreamSubscription._sendData (dart:async/stream_impl.dart:381:11)
#4      _DelayedData.perform (dart:async/stream_impl.dart:573:14)
#5      _PendingEvents.handleNext (dart:async/stream_impl.dart:678:11)
#6      _PendingEvents.schedule.<anonymous closure> (dart:async/stream_impl.dart:649:7)
#7      StackZoneSpecification._run (package:stack_trace/src/stack_zone_specification.dart:207:15)
#8      StackZoneSpecification._registerCallback.<anonymous closure> (package:stack_trace/src/stack_zone_specification.dart:114:48)
#9      _rootRun (dart:async/zone.dart:1517:47)
#10     _CustomZone.run (dart:async/zone.dart:1422:19)
#11     _CustomZone.runGuarded (dart:async/zone.dart:1321:7)
#12     _CustomZone.bindCallbackGuarded.<anonymous closure> (dart:async/zone.dart:1362:23)
#13     StackZoneSpecification._run (package:stack_trace/src/stack_zone_specification.dart:207:15)
#14     StackZoneSpecification._registerCallback.<anonymous closure> (package:stack_trace/src/stack_zone_specification.dart:114:48)
#15     _rootRun (dart:async/zone.dart:1525:13)
#16     _CustomZone.run (dart:async/zone.dart:1422:19)
#17     _CustomZone.runGuarded (dart:async/zone.dart:1321:7)
#18     _CustomZone.bindCallbackGuarded.<anonymous closure> (dart:async/zone.dart:1362:23)
#19     _microtaskLoop (dart:async/schedule_microtask.dart:40:35)
#20     _startMicrotaskLoop (dart:async/schedule_microtask.dart:49:5)
#21     _runPendingImmediateCallback (dart:isolate-patch/isolate_patch.dart:127:13)
#22     _RawReceivePort._handleMessage (dart:isolate-patch/isolate_patch.dart:194:5)

══╡ EXCEPTION CAUGHT BY WIDGETS LIBRARY ╞═══════════════════════════════════════════════════════════ [js_primitives.dart:28:5](http://localhost:8080/packages/dart-sdk/lib/_internal/js_dev_runtime/private/js_primitives.dart)
The following StateError was thrown building MyApp(dirty, state: _ConsumerState#57276): [js_primitives.dart:28:5](http://localhost:8080/packages/dart-sdk/lib/_internal/js_dev_runtime/private/js_primitives.dart)
Bad state: No ProviderScope found [js_primitives.dart:28:5](http://localhost:8080/packages/dart-sdk/lib/_internal/js_dev_runtime/private/js_primitives.dart)
<empty string> [js_primitives.dart:28:5](http://localhost:8080/packages/dart-sdk/lib/_internal/js_dev_runtime/private/js_primitives.dart)
The relevant error-causing widget was: [js_primitives.dart:28:5](http://localhost:8080/packages/dart-sdk/lib/_internal/js_dev_runtime/private/js_primitives.dart)
  MyApp MyApp:org-dartlang-app:///packages/articlett_schule_webpage/pages/test.dart:22:28 [js_primitives.dart:28:5](http://localhost:8080/packages/dart-sdk/lib/_internal/js_dev_runtime/private/js_primitives.dart)
<empty string> [js_primitives.dart:28:5](http://localhost:8080/packages/dart-sdk/lib/_internal/js_dev_runtime/private/js_primitives.dart)
When the exception was thrown, this was the stack: [js_primitives.dart:28:5](http://localhost:8080/packages/dart-sdk/lib/_internal/js_dev_runtime/private/js_primitives.dart)
package:dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 223:26  DartError [js_primitives.dart:28:5](http://localhost:8080/packages/dart-sdk/lib/_internal/js_dev_runtime/private/js_primitives.dart)
package:dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 274:3   throw_ [js_primitives.dart:28:5](http://localhost:8080/packages/dart-sdk/lib/_internal/js_dev_runtime/private/js_primitives.dart)
package:flutter_riverpod/src/core/provider_scope.dart 105:7                           containerOf [js_primitives.dart:28:5](http://localhost:8080/packages/dart-sdk/lib/_internal/js_dev_runtime/private/js_primitives.dart)
package:flutter_riverpod/src/core/consumer.dart 512:59                                read [js_primitives.dart:28:5](http://localhost:8080/packages/dart-sdk/lib/_internal/js_dev_runtime/private/js_primitives.dart)
package:flutter_test_app/main.dart 27:24                                              build [js_primitives.dart:28:5](http://localhost:8080/packages/dart-sdk/lib/_internal/js_dev_runtime/private/js_primitives.dart)
package:flutter_riverpod/src/core/consumer.dart 283:48                                build [js_primitives.dart:28:5](http://localhost:8080/packages/dart-sdk/lib/_internal/js_dev_runtime/private/js_primitives.dart)
package:flutter/src/widgets/framework.dart 5934:27                                    build [js_primitives.dart:28:5](http://localhost:8080/packages/dart-sdk/lib/_internal/js_dev_runtime/private/js_primitives.dart)
package:flutter_riverpod/src/core/consumer.dart 421:20                                build [js_primitives.dart:28:5](http://localhost:8080/packages/dart-sdk/lib/_internal/js_dev_runtime/private/js_primitives.dart)
package:flutter/src/widgets/framework.dart 5820:15                                    performRebuild [js_primitives.dart:28:5](http://localhost:8080/packages/dart-sdk/lib/_internal/js_dev_runtime/private/js_primitives.dart)
package:flutter/src/widgets/framework.dart 5985:11                                    performRebuild [js_primitives.dart:28:5](http://localhost:8080/packages/dart-sdk/lib/_internal/js_dev_runtime/private/js_primitives.dart)
package:flutter/src/widgets/framework.dart 5532:7                                     rebuild [js_primitives.dart:28:5](http://localhost:8080/packages/dart-sdk/lib/_internal/js_dev_runtime/private/js_primitives.dart)
package:flutter/src/widgets/framework.dart 5802:5                                     [_firstBuild] [js_primitives.dart:28:5](http://localhost:8080/packages/dart-sdk/lib/_internal/js_dev_runtime/private/js_primitives.dart)
package:flutter/src/widgets/framework.dart 5976:11                                    [_firstBuild] [js_primitives.dart:28:5](http://localhost:8080/packages/dart-sdk/lib/_internal/js_dev_runtime/private/js_primitives.dart)
package:flutter/src/widgets/framework.dart 5796:5                                     mount [js_primitives.dart:28:5](http://localhost:8080/packages/dart-sdk/lib/_internal/js_dev_runtime/private/js_primitives.dart)
...     Normal element mounting (71 frames) [js_primitives.dart:28:5](http://localhost:8080/packages/dart-sdk/lib/_internal/js_dev_runtime/private/js_primitives.dart)
package:flutter/src/widgets/framework.dart 4590:19                                    inflateWidget [js_primitives.dart:28:5](http://localhost:8080/packages/dart-sdk/lib/_internal/js_dev_runtime/private/js_primitives.dart)
package:flutter/src/widgets/framework.dart 4059:18                                    updateChild [js_primitives.dart:28:5](http://localhost:8080/packages/dart-sdk/lib/_internal/js_dev_runtime/private/js_primitives.dart)
package:flutter/src/widgets/view.dart 481:16                                          [_updateChild] [js_primitives.dart:28:5](http://localhost:8080/packages/dart-sdk/lib/_internal/js_dev_runtime/private/js_primitives.dart)
package:flutter/src/widgets/view.dart 504:5                                           mount [js_primitives.dart:28:5](http://localhost:8080/packages/dart-sdk/lib/_internal/js_dev_runtime/private/js_primitives.dart)
...     Normal element mounting (15 frames) [js_primitives.dart:28:5](http://localhost:8080/packages/dart-sdk/lib/_internal/js_dev_runtime/private/js_primitives.dart)
package:flutter/src/widgets/framework.dart 4590:19                                    inflateWidget [js_primitives.dart:28:5](http://localhost:8080/packages/dart-sdk/lib/_internal/js_dev_runtime/private/js_primitives.dart)
package:flutter/src/widgets/framework.dart 4059:18                                    updateChild [js_primitives.dart:28:5](http://localhost:8080/packages/dart-sdk/lib/_internal/js_dev_runtime/private/js_primitives.dart)
package:flutter/src/widgets/framework.dart 4258:32                                    updateChildren [js_primitives.dart:28:5](http://localhost:8080/packages/dart-sdk/lib/_internal/js_dev_runtime/private/js_primitives.dart)
package:flutter/src/widgets/view.dart 837:21                                          performRebuild [js_primitives.dart:28:5](http://localhost:8080/packages/dart-sdk/lib/_internal/js_dev_runtime/private/js_primitives.dart)
package:flutter/src/widgets/framework.dart 5532:7                                     rebuild [js_primitives.dart:28:5](http://localhost:8080/packages/dart-sdk/lib/_internal/js_dev_runtime/private/js_primitives.dart)
package:flutter/src/widgets/view.dart 761:5                                           mount [js_primitives.dart:28:5](http://localhost:8080/packages/dart-sdk/lib/_internal/js_dev_runtime/private/js_primitives.dart)
...     Normal element mounting (9 frames) [js_primitives.dart:28:5](http://localhost:8080/packages/dart-sdk/lib/_internal/js_dev_runtime/private/js_primitives.dart)
package:flutter/src/widgets/framework.dart 4590:19                                    inflateWidget [js_primitives.dart:28:5](http://localhost:8080/packages/dart-sdk/lib/_internal/js_dev_runtime/private/js_primitives.dart)
package:flutter/src/widgets/framework.dart 4059:18                                    updateChild [js_primitives.dart:28:5](http://localhost:8080/packages/dart-sdk/lib/_internal/js_dev_runtime/private/js_primitives.dart)
package:flutter/src/widgets/binding.dart 1782:16                                      [_rebuild] [js_primitives.dart:28:5](http://localhost:8080/packages/dart-sdk/lib/_internal/js_dev_runtime/private/js_primitives.dart)
package:flutter/src/widgets/binding.dart 1751:5                                       mount [js_primitives.dart:28:5](http://localhost:8080/packages/dart-sdk/lib/_internal/js_dev_runtime/private/js_primitives.dart)
package:flutter/src/widgets/binding.dart 1704:16                                      <fn> [js_primitives.dart:28:5](http://localhost:8080/packages/dart-sdk/lib/_internal/js_dev_runtime/private/js_primitives.dart)
package:flutter/src/widgets/framework.dart 3101:11                                    buildScope [js_primitives.dart:28:5](http://localhost:8080/packages/dart-sdk/lib/_internal/js_dev_runtime/private/js_primitives.dart)
package:flutter/src/widgets/binding.dart 1703:12                                      attach [js_primitives.dart:28:5](http://localhost:8080/packages/dart-sdk/lib/_internal/js_dev_runtime/private/js_primitives.dart)
package:flutter/src/widgets/binding.dart 1379:26                                      attachToBuildOwner [js_primitives.dart:28:5](http://localhost:8080/packages/dart-sdk/lib/_internal/js_dev_runtime/private/js_primitives.dart)
package:flutter/src/widgets/binding.dart 1364:5                                       attachRootWidget [js_primitives.dart:28:5](http://localhost:8080/packages/dart-sdk/lib/_internal/js_dev_runtime/private/js_primitives.dart)
package:flutter/src/widgets/binding.dart 1350:7                                       <fn> [js_primitives.dart:28:5](http://localhost:8080/packages/dart-sdk/lib/_internal/js_dev_runtime/private/js_primitives.dart)
package:dart-sdk/lib/_internal/js_dev_runtime/private/isolate_helper.dart 47:11       internalCallback [js_primitives.dart:28:5](http://localhost:8080/packages/dart-sdk/lib/_internal/js_dev_runtime/private/js_primitives.dart)
package:dart-sdk/lib/_internal/js_dev_runtime/private/isolate_helper.dart 54:9        <fn> [js_primitives.dart:28:5](http://localhost:8080/packages/dart-sdk/lib/_internal/js_dev_runtime/private/js_primitives.dart)
package:dart-sdk/lib/_internal/js_dev_runtime/patch/async_patch.dart 199:12           _createTimer [js_primitives.dart:28:5](http://localhost:8080/packages/dart-sdk/lib/_internal/js_dev_runtime/private/js_primitives.dart)
<empty string> [js_primitives.dart:28:5](http://localhost:8080/packages/dart-sdk/lib/_internal/js_dev_runtime/private/js_primitives.dart)
════════════════════════════════════════════════════════════════════════════════════════════════════

Steps To Reproduce

1. git clone https://github.com/nietsmmar/jaspr_test.git
2. git switch no_matomo_gorouter_riverpod
3. run jaspr serve
4. navigate to test page
5. check dev-tools output in browser console

Doctor Output

[✓] Jaspr CLI (Version 0.22.1)
  • Dart Version 3.10.4 (stable) (Tue Dec 9 00:01:55 2025 -0800) on "linux_x64" at /home/xunil/dev/flutter/bin/cache/dart-sdk/bin/dart
  • Running on linux Linux 6.12.63 #1-NixOS SMP PREEMPT_DYNAMIC Thu Dec 18 12:55:23 UTC 2025 - Locale en_US.UTF-8
  • Analytics: Enabled
[✓] Current Project
  • Dependencies on core packages:
    • jaspr: ^0.22.1
    • jaspr_builder: ^0.22.1 (dev)
    • jaspr_flutter_embed: ^0.4.10
    • jaspr_router: ^0.8.1
  • Rendering mode: static
  • Flutter mode: embedded

Expected Behavior

Embedded flutter app shows

[schultek]

As the error sais, you're missing a ProviderScope somewhere.