🐛 [flutterfire] Firebase initialization exception: "Error: Expected a value of type 'Object', but got one of type 'Null'

[Codseus]

Bug report

Describe the bug
Runs fine if "flutter run" is used, but throws exception with debug mode (F5).

full error code:

Exception has occurred.
"Error: Expected a value of type 'Object', but got one of type 'Null'
dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 294:49      throw_
dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 127:3       castError
dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/operations.dart 742:12  cast
dart-sdk/lib/_internal/js_dev_runtime/patch/core_patch.dart 78:24                 as
packages/firebase_core_web/src/firebase_core_web.dart 87:20                       get [_ignoredServiceScripts]
packages/firebase_core_web/src/firebase_core_web.dart 163:28                      _initializeCore
dart-sdk/lib/_internal/js_dev_runtime/patch/async_patch.dart 84:54                runBody
dart-sdk/lib/_internal/js_dev_runtime/patch/async_patch.dart 127:5                _async
packages/firebase_core_web/src/firebase_core_web.dart 155:31                      [_initializeCore]
packages/firebase_core_web/src/firebase_core_web.dart 197:11                      initializeApp
dart-sdk/lib/_internal/js_dev_runtime/patch/async_patch.dart 84:54                runBody
dart-sdk/lib/_internal/js_dev_runtime/patch/async_patch.dart 127:5                _async
packages/firebase_core_web/src/firebase_core_web.dart 193:44                      initializeApp
packages/firebase_core/src/firebase.dart 43:47                                    initializeApp
dart-sdk/lib/_internal/js_dev_runtime/patch/async_patch.dart 84:54                runBody
dart-sdk/lib/_internal/js_dev_runtime/patch/async_patch.dart 127:5                _async
packages/firebase_core/src/firebase.dart 39:43                                    initializeApp
packages/project123/main.dart 6:18                                               main
dart-sdk/lib/_internal/js_dev_runtime/patch/async_patch.dart 84:54                runBody
dart-sdk/lib/_internal/js_dev_runtime/patch/async_patch.dart 127:5                _async
packages/project123/main.dart 5:10                                               main$
web_entrypoint.dart 24:31                                                         <fn>
lib/ui_web/ui_web/initialization.dart 41:15                                       <fn>
dart-sdk/lib/_internal/js_dev_runtime/patch/async_patch.dart 45:50                <fn>
dart-sdk/lib/async/zone.dart 1661:54                                              runUnary
dart-sdk/lib/async/future_impl.dart 156:18                                        handleValue
dart-sdk/lib/async/future_impl.dart 840:44                                        handleValueCallback
dart-sdk/lib/async/future_impl.dart 869:13                                        _propagateToListeners
dart-sdk/lib/async/future_impl.dart 641:5                                         [_completeWithValue]
dart-sdk/lib/async/future_impl.dart 715:7                                         callback
dart-sdk/lib/async/schedule_microtask.dart 40:11                                  _microtaskLoop
dart-sdk/lib/async/schedule_microtask.dart 49:5                                   _startMicrotaskLoop
dart-sdk/lib/_internal/js_dev_runtime/patch/async_patch.dart 181:15               <fn>
"

Steps to reproduce

Steps to reproduce the behavior:

1. Install latest flutter version (3.13.6)
2. Create a firebase project
3. add firebase core and auth dependencies
4. configure with flutterfire configure
5. add initalizeApp to main function.
6. run with debug mode All exceptions and Uncaught Exceptions enabled.

Expected behavior

Has to work fine.

Sample project

Just use flutter create, don't add anything but this to main.dart:

void main() async {
  await Firebase.initializeApp(
    options: DefaultFirebaseOptions.currentPlatform,
  );
  runApp(const MyApp());
}

---

Additional context

Debug mode suddenly started throwing this exception, probably after I upgraded flutter version.
I was using windows but, just to make sure I didn't mess anything on my end, I installed fedora on my other drive.
Still same issue happens.

---

Flutter doctor

Run flutter doctor and paste the output below:

Click To Expand

Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel stable, 3.13.6, on Fedora Linux 38 (KDE Plasma) 6.2.9-300.fc38.x86_64, locale
    en_US.UTF-8)
[✓] Android toolchain - develop for Android devices (Android SDK version 34.0.0)
[✓] Chrome - develop for the web
[✓] Linux toolchain - develop for Linux desktop
[✓] Android Studio (version 2022.3)
[✓] VS Code (version 1.83.0)
[✓] Connected device (2 available)
[✓] Network resources

• No issues found!

---

Flutter dependencies

Run flutter pub deps -- --style=compact and paste the output below:

Click To Expand

Dart SDK 3.1.3
Flutter SDK 3.13.6
restauranco 1.0.0+1

dependencies:
- cupertino_icons 1.0.6
- firebase_auth 4.10.1 [firebase_auth_platform_interface firebase_auth_web firebase_core firebase_core_platform_interface flutter meta]
- firebase_core 2.17.0 [firebase_core_platform_interface firebase_core_web flutter meta]
- flutter 0.0.0 [characters collection material_color_utilities meta vector_math web sky_engine]

dev dependencies:
- flutter_lints 2.0.3 [lints]
- flutter_test 0.0.0 [flutter test_api matcher path fake_async clock stack_trace vector_math async boolean_selector characters collection material_color_utilities meta source_span stream_channel string_scanner term_glyph web]

transitive dependencies:
- _flutterfire_internals 1.3.7 [collection firebase_core firebase_core_platform_interface flutter meta]
- async 2.11.0 [collection meta]
- boolean_selector 2.1.1 [source_span string_scanner]
- characters 1.3.0
- clock 1.1.1
- collection 1.17.2
- fake_async 1.3.1 [clock collection]
- firebase_auth_platform_interface 6.19.1 [_flutterfire_internals collection firebase_core flutter meta plugin_platform_interface]
- firebase_auth_web 5.8.2 [firebase_auth_platform_interface firebase_core firebase_core_web flutter flutter_web_plugins http_parser js meta]
- firebase_core_platform_interface 4.8.0 [collection flutter flutter_test meta plugin_platform_interface]
- firebase_core_web 2.8.0 [firebase_core_platform_interface flutter flutter_web_plugins js meta]
- flutter_web_plugins 0.0.0 [flutter characters collection material_color_utilities meta vector_math web]
- http_parser 4.0.2 [collection source_span string_scanner typed_data]
- js 0.6.7 [meta]
- lints 2.1.1
- matcher 0.12.16 [async meta stack_trace term_glyph test_api]
- material_color_utilities 0.5.0 [collection]
- meta 1.9.1
- path 1.8.3
- plugin_platform_interface 2.1.6 [meta]
- sky_engine 0.0.99
- source_span 1.10.0 [collection path term_glyph]
- stack_trace 1.11.0 [path]
- stream_channel 2.1.1 [async]
- string_scanner 1.2.0 [source_span]
- term_glyph 1.2.1
- test_api 0.6.0 [async boolean_selector collection meta source_span stack_trace stream_channel string_scanner term_glyph]
- typed_data 1.3.2 [collection]
- vector_math 2.1.4
- web 0.1.4-beta

---

[Codseus]

Actually, even if I use flutter run, I don't get the exception error but, when user tries to log in with firebase auth it freezes the app, most likely because Firebase didn't initialize.
For 2 days I couldn't develop my app, I don't know if this is a problem with latest flutter version, but please let me know which version to downgrade, so I can move on with development.

[darshankawar]

Thanks for the report @Codseus

6. run with debug mode All exceptions and Uncaught Exceptions enabled.

I am wondering if this is related to dart specifically and it's effect rippled to flutterfire plugins. See dart-lang/sdk#53334 and check if it helps further or not.

[Codseus]

Nothing is working, I read through every issue here but none has a solution, I downgraded to flutter 3.10.0 and downgraded firebase core and firebase auth dependencies too, but still the same problem.

[darshankawar]

I am unable to replicate the error after following all the steps you mentioned. Can you reconfigure your firebase integration by first updating the cli tool and then reselecting the firebase project ?

[Codseus]

My flutterfire cli is already up to date, but I reactivated again to make sure. I did flutterfire configure again. Still getting the same exception.

I added this line on my main.dart to check if firebase initializes late,

Firebase.apps.isEmpty
      ? print('Firebase not initialized')
      : print('Firebase initialized');

I am not getting any print on debug mode since the exception stops the app but when running with flutter run, I am always getting 'firebase initialized', I am never getting the not initialized printed. Maybe this is a flutter problem rather than flutterfire problem, or a firebase_core problem.

Note:
Even though Firebase initializes fine on flutter run, If I try to listen authStateChanges when no user is logged, my app freezes so I cannot do redirects on my login page. I guess I have to work with that for now until this problem is fixed.