🐛 [firebase_ui_auth] Crash on sign out in web: Unexpected null value

[martinsellergren]

Is there an existing issue for this?

• I have searched the existing issues and found no duplicates.

What plugin is this bug for?

Firebase UI Auth

What platform(s) does this bug affect?

Web

List of dependencies used.

flutter pub deps -s list

[flutter] f pub deps -s list                                                                                                                                                                                                            main
Dart SDK 3.3.0
Flutter SDK 3.19.1
chat_app 1.0.0+1
dependencies:

firebase_auth 4.17.9

firebase_auth_platform_interface ^7.1.9
firebase_auth_web ^5.10.0
firebase_core ^2.27.1
firebase_core_platform_interface ^5.0.0
flutter any
meta ^1.8.0


firebase_core 2.27.1

firebase_core_platform_interface ^5.0.0
firebase_core_web ^2.12.0
flutter any
meta ^1.8.0


firebase_dynamic_links 5.4.18

firebase_core ^2.27.1
firebase_core_platform_interface ^5.0.0
firebase_dynamic_links_platform_interface ^0.2.6+26
flutter any
meta ^1.8.0
plugin_platform_interface ^2.1.3


firebase_ui_auth 1.13.1

email_validator ^2.1.17
firebase_auth ^4.17.5
firebase_core ^2.25.4
firebase_dynamic_links ^5.4.14
firebase_ui_localizations ^1.10.2
firebase_ui_oauth ^1.5.1
firebase_ui_shared ^1.4.1
flutter any
flutter_localizations any
meta ^1.10.0


flutter 0.0.0

characters 1.3.0
collection 1.18.0
material_color_utilities 0.8.0
meta 1.11.0
vector_math 2.1.4
sky_engine any


freezed_annotation 2.4.1

collection ^1.15.0
json_annotation ^4.6.0
meta ^1.7.0


imp_router 0.2.1

flutter any
animations ^2.0.11
collection ^1.18.0
provider ^6.1.1
rxdart ^0.27.7
flutter_web_plugins any
meta ^1.11.0


provider 6.1.2

collection ^1.15.0
flutter any
nested ^1.0.0


rxdart 0.27.7
state_notifier 1.0.0

meta ^1.1.8



dev dependencies:

flutter_test 0.0.0

flutter any
test_api 0.6.1
matcher 0.12.16+1
path 1.9.0
fake_async 1.3.1
clock 1.1.1
stack_trace 1.11.1
vector_math 2.1.4
leak_tracker_flutter_testing 2.0.1
async 2.11.0
boolean_selector 2.1.1
characters 1.3.0
collection 1.18.0
leak_tracker 10.0.0
leak_tracker_testing 2.0.1
material_color_utilities 0.8.0
meta 1.11.0
source_span 1.10.0
stream_channel 2.1.2
string_scanner 1.2.0
term_glyph 1.2.1
vm_service 13.0.0


flutter_lints 3.0.1

lints ^3.0.0


freezed 2.4.7

analyzer >=5.13.0 <7.0.0
build ^2.3.1
build_config ^1.1.0
collection ^1.15.0
meta ^1.9.1
source_gen ^1.2.3
freezed_annotation ^2.4.1
json_annotation ^4.6.0


build_runner 2.4.8

analyzer >=4.4.0 <7.0.0
args ^2.0.0
async ^2.5.0
build >=2.1.0 <2.5.0
build_config >=1.1.0 <1.2.0
build_daemon ^4.0.0
build_resolvers ^2.0.0
build_runner_core ^7.2.0
code_builder ^4.2.0
collection ^1.15.0
crypto ^3.0.0
dart_style ^2.0.0
frontend_server_client ^3.0.0
glob ^2.0.0
graphs ^2.2.0
http_multi_server ^3.0.0
io ^1.0.0
js >=0.6.3 <0.8.0
logging ^1.0.0
meta ^1.3.0
mime ^1.0.0
package_config ^2.0.0
path ^1.8.0
pool ^1.5.0
pub_semver ^2.0.0
pubspec_parse ^1.0.0
shelf ^1.0.0
shelf_web_socket ^1.0.0
stack_trace ^1.10.0
stream_transform ^2.0.0
timing ^1.0.0
watcher ^1.0.0
web_socket_channel ^2.0.0
yaml ^3.0.0



transitive dependencies:

_fe_analyzer_shared 67.0.0

meta ^1.9.0


_flutterfire_internals 1.3.26

collection ^1.0.0
firebase_core ^2.27.1
firebase_core_platform_interface ^5.0.0
flutter any
meta ^1.8.0


analyzer 6.4.1

_fe_analyzer_shared ^67.0.0
collection ^1.17.0
convert ^3.0.0
crypto ^3.0.0
glob ^2.0.0
meta ^1.11.0
package_config ^2.0.0
path ^1.8.0
pub_semver ^2.1.4
source_span ^1.8.0
watcher ^1.1.0
yaml ^3.0.0


animations 2.0.11

flutter any


args 2.4.2
async 2.11.0

collection ^1.15.0
meta ^1.1.7


boolean_selector 2.1.1

source_span ^1.8.0
string_scanner ^1.1.0


build 2.4.1

analyzer >=1.5.0 <7.0.0
async ^2.5.0
convert ^3.0.0
crypto ^3.0.0
glob ^2.0.0
logging ^1.0.0
meta ^1.3.0
package_config ^2.1.0
path ^1.8.0


build_config 1.1.1

checked_yaml ^2.0.0
json_annotation ^4.5.0
path ^1.8.0
pubspec_parse ^1.0.0
yaml ^3.0.0


build_daemon 4.0.1

built_collection ^5.0.0
built_value ^8.1.0
crypto ^3.0.3
http_multi_server ^3.0.0
logging ^1.0.0
path ^1.8.0
pool ^1.5.0
shelf ^1.0.0
shelf_web_socket ^1.0.0
stream_transform ^2.0.0
watcher ^1.0.0
web_socket_channel ^2.0.0


build_resolvers 2.4.2

analyzer >=5.12.0 <7.0.0
async ^2.5.0
build ^2.0.0
collection ^1.17.0
convert ^3.1.1
crypto ^3.0.0
graphs >=1.0.0 <3.0.0
logging ^1.0.0
package_config ^2.0.0
path ^1.8.0
pool ^1.5.0
pub_semver ^2.0.0
stream_transform ^2.0.0
yaml ^3.0.0


build_runner_core 7.3.0

async ^2.5.0
build ^2.4.0
build_config ^1.0.0
build_resolvers ^2.4.0
collection ^1.15.0
convert ^3.0.0
crypto ^3.0.0
glob ^2.0.0
graphs ^2.0.0
json_annotation ^4.8.1
logging ^1.2.0
meta ^1.3.0
package_config ^2.0.0
path ^1.8.0
pool ^1.5.0
timing ^1.0.0
watcher ^1.0.0
yaml ^3.0.0


built_collection 5.1.1
built_value 8.9.1

built_collection ^5.0.0
collection ^1.15.0
fixnum ^1.0.0
meta ^1.3.0


characters 1.3.0
checked_yaml 2.0.3

json_annotation ^4.3.0
source_span ^1.8.0
yaml ^3.0.0


clock 1.1.1
code_builder 4.10.0

built_collection ^5.0.0
built_value ^8.0.0
collection ^1.15.0
matcher ^0.12.10
meta ^1.3.0


collection 1.18.0
convert 3.1.1

typed_data ^1.3.0


crypto 3.0.3

typed_data ^1.3.0


dart_style 2.3.6

analyzer ^6.2.0
args >=1.0.0 <3.0.0
collection ^1.17.0
path ^1.0.0
pub_semver >=1.4.4 <3.0.0
source_span ^1.4.0


desktop_webview_auth 0.0.15

crypto ^3.0.3
flutter any
http ^1.0.0
flutter_web_plugins any
plugin_platform_interface ^2.1.4


email_validator 2.1.17
fake_async 1.3.1

clock ^1.1.0
collection ^1.15.0


file 7.0.0

meta ^1.9.1
path ^1.8.3


firebase_auth_platform_interface 7.1.9

_flutterfire_internals ^1.3.26
collection ^1.16.0
firebase_core ^2.27.1
flutter any
meta ^1.8.0
plugin_platform_interface ^2.1.3


firebase_auth_web 5.10.0

firebase_auth_platform_interface ^7.1.9
firebase_core ^2.27.1
firebase_core_web ^2.12.0
flutter any
flutter_web_plugins any
http_parser ^4.0.0
js ^0.6.3
meta ^1.8.0
web ^0.5.1


firebase_core_platform_interface 5.0.0

collection ^1.0.0
flutter any
flutter_test any
meta ^1.8.0
plugin_platform_interface ^2.1.3


firebase_core_web 2.12.0

firebase_core_platform_interface ^5.0.0
flutter any
flutter_web_plugins any
js ^0.6.3
meta ^1.8.0
web ^0.5.1


firebase_dynamic_links_platform_interface 0.2.6+26

_flutterfire_internals ^1.3.26
firebase_core ^2.27.1
flutter any
meta ^1.8.0
plugin_platform_interface ^2.1.3


firebase_ui_localizations 1.10.2

flutter any
flutter_localizations any
path ^1.8.3


firebase_ui_oauth 1.5.1

desktop_webview_auth ^0.0.14
firebase_auth ^4.17.5
firebase_ui_auth ^1.13.1
firebase_ui_shared ^1.4.1
flutter_svg ^2.0.9
flutter any


firebase_ui_shared 1.4.1

flutter any


fixnum 1.1.0
flutter_localizations 0.0.0

flutter any
intl 0.18.1
characters 1.3.0
clock 1.1.1
collection 1.18.0
material_color_utilities 0.8.0
meta 1.11.0
path 1.9.0
vector_math 2.1.4


flutter_svg 2.0.10+1

flutter any
http ^1.0.0
vector_graphics ^1.1.11
vector_graphics_codec ^1.1.11
vector_graphics_compiler ^1.1.11


flutter_web_plugins 0.0.0

flutter any
characters 1.3.0
collection 1.18.0
material_color_utilities 0.8.0
meta 1.11.0
vector_math 2.1.4


frontend_server_client 3.2.0

async ^2.5.0
path ^1.8.0


glob 2.1.2

async ^2.5.0
collection ^1.15.0
file >=6.1.3 <8.0.0
path ^1.8.0
string_scanner ^1.1.0


graphs 2.3.1

collection ^1.1.0


http 1.2.1

async ^2.5.0
http_parser ^4.0.0
meta ^1.3.0
web ^0.5.0


http_multi_server 3.2.1

async ^2.5.0


http_parser 4.0.2

collection ^1.15.0
source_span ^1.8.0
string_scanner ^1.1.0
typed_data ^1.3.0


intl 0.18.1

clock ^1.1.0
meta ^1.0.2
path ^1.8.0


io 1.0.4

meta ^1.3.0
path ^1.8.0
string_scanner ^1.1.0


js 0.6.7

meta ^1.7.0


json_annotation 4.8.1

meta ^1.4.0


leak_tracker 10.0.0

clock ^1.1.1
collection ^1.15.0
meta ^1.8.0
path ^1.8.3
vm_service >=11.10.0 <15.0.0


leak_tracker_flutter_testing 2.0.1

flutter any
leak_tracker >=10.0.0 <11.0.0
leak_tracker_testing >=2.0.1 <3.0.0
matcher ^0.12.16
meta ^1.8.0


leak_tracker_testing 2.0.1

leak_tracker >=9.0.0 <11.0.0
matcher ^0.12.16
meta ^1.11.0


lints 3.0.0
logging 1.2.0
matcher 0.12.16+1

async ^2.10.0
meta ^1.8.0
stack_trace ^1.10.0
term_glyph ^1.2.0
test_api >=0.5.0 <0.8.0


material_color_utilities 0.8.0

collection ^1.15.0


meta 1.11.0
mime 1.0.5
nested 1.0.0

flutter any


package_config 2.1.0

path ^1.8.0


path 1.9.0
path_parsing 1.0.1

vector_math ^2.1.0
meta ^1.3.0


petitparser 6.0.2

meta ^1.9.0


plugin_platform_interface 2.1.8

meta ^1.3.0


pool 1.5.1

async ^2.5.0
stack_trace ^1.10.0


pub_semver 2.1.4

collection ^1.15.0
meta ^1.3.0


pubspec_parse 1.2.3

checked_yaml ^2.0.1
collection ^1.15.0
json_annotation ^4.8.0
pub_semver ^2.0.0
yaml ^3.0.0


shelf 1.4.1

async ^2.5.0
collection ^1.15.0
http_parser ^4.0.0
path ^1.8.0
stack_trace ^1.10.0
stream_channel ^2.1.0


shelf_web_socket 1.0.4

shelf ^1.1.0
stream_channel ^2.1.0
web_socket_channel ^2.0.0


sky_engine 0.0.99
source_gen 1.5.0

analyzer >=5.2.0 <7.0.0
async ^2.5.0
build ^2.1.0
dart_style ^2.0.0
glob ^2.0.0
path ^1.8.0
source_span ^1.8.0
yaml ^3.0.0


source_span 1.10.0

collection ^1.15.0
path ^1.8.0
term_glyph ^1.2.0


stack_trace 1.11.1

path ^1.8.0


stream_channel 2.1.2

async ^2.5.0


stream_transform 2.1.0
string_scanner 1.2.0

source_span ^1.8.0


term_glyph 1.2.1
test_api 0.6.1

async ^2.5.0
boolean_selector ^2.1.0
collection ^1.15.0
meta ^1.3.0
source_span ^1.8.0
stack_trace ^1.10.0
stream_channel ^2.1.0
string_scanner ^1.1.0
term_glyph ^1.2.0


timing 1.0.1

json_annotation ^4.3.0


typed_data 1.3.2

collection ^1.15.0


vector_graphics 1.1.11+1

flutter any
http ^1.0.0
vector_graphics_codec 1.1.11+1


vector_graphics_codec 1.1.11+1
vector_graphics_compiler 1.1.11+1

args ^2.3.0
meta ^1.7.0
path_parsing ^1.0.1
xml ^6.3.0
vector_graphics_codec 1.1.11+1
path ^1.8.0


vector_math 2.1.4
vm_service 13.0.0
watcher 1.1.0

async ^2.5.0
path ^1.8.0


web 0.5.1
web_socket_channel 2.4.4

async ^2.5.0
crypto ^3.0.0
stream_channel ^2.1.0
web ^0.5.0


xml 6.5.0

collection ^1.18.0
meta ^1.9.0
petitparser ^6.0.0


yaml 3.1.2

collection ^1.15.0
source_span ^1.8.0
string_scanner ^1.1.0

Steps to reproduce

1. Login
2. Logout from ProfileScreen (or delete account)

Expected Behavior

No error thrown.

Actual Behavior

Error thrown:

══╡ EXCEPTION CAUGHT BY WIDGETS LIBRARY ╞═══════════════════════════════════════════════════════════
The following TypeErrorImpl was thrown building Builder(dirty):
Unexpected null value.

The relevant error-causing widget was:
  ProfileScreen
  ProfileScreen:file:///Users/martin/dev/firebasetesting/chatapp/flutter/lib/pages/profile/profile_page.dart:14:12

When the exception was thrown, this was the stack:
dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 297:3       throw_
dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/operations.dart 806:18  nullCheck
packages/firebase_ui_auth/src/screens/profile_screen.dart 809:34                  buildPage
packages/flutter/src/widgets/basic.dart 7698:48                                   build
packages/flutter/src/widgets/framework.dart 5550:22                               build
packages/flutter/src/widgets/framework.dart 5480:15                               performRebuild
packages/flutter/src/widgets/framework.dart 5196:7                                rebuild
packages/flutter/src/widgets/framework.dart 2904:18                               buildScope
packages/flutter/src/widgets/binding.dart 989:9                                   drawFrame
packages/flutter/src/rendering/binding.dart 448:5                                 [_handlePersistentFrameCallback]
packages/flutter/src/scheduler/binding.dart 1386:7                                [_invokeFrameCallback]
packages/flutter/src/scheduler/binding.dart 1311:9                                handleDrawFrame
packages/flutter/src/scheduler/binding.dart 1169:5                                [_handleDrawFrame]
lib/_engine/engine/platform_dispatcher.dart 1346:5                                invoke
lib/_engine/engine/platform_dispatcher.dart 260:5                                 invokeOnDrawFrame
lib/_engine/engine/initialization.dart 185:36                                     <fn>
dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/operations.dart 550:37  _checkAndCall
dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/operations.dart 555:39  dcall

════════════════════════════════════════════════════════════════════════════════════════════════════

Additional Information

ProfileScreen created like this:

ProfileScreen(
      auth: firebaseAuth,
      providers: const [],
      appBar: AppBar(
        leading: BackButton(onPressed: () => context.router.pop()),
      ),
      showDeleteConfirmationDialog: true,
      actions: [
        SignedOutAction((context) => context.router.pop()),
        AccountDeletedAction((context, user) => context.router.pop()),
      ],
    )

Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel stable, 3.19.1, on macOS 14.2.1 23C71 darwin-arm64, locale en-US)
[✓] Android toolchain - develop for Android devices (Android SDK version 34.0.0)
[✓] Xcode - develop for iOS and macOS (Xcode 15.0)
[✓] Chrome - develop for the web
[✓] Android Studio (version 2023.1)
[✓] VS Code (version 1.87.1)
[✓] Connected device (3 available)
[✓] Network resources

• No issues found!

[russellwheatley]

I've just tested on the auth example app, I think there is a problem with your setup as I logged in/out without issue on web.

[Lejoni]

I get the same error in my Android app using ProfileScreen.
For me the error is triggered when SignedOutAction has a callback function that tries to do anything else than just navigate to a new screen.

Example1 works fine, no error:

return ProfileScreen(
            providers: providers,
            actions: [
              SignedOutAction((context) {
                Navigator.pushReplacementNamed(context, '/');
              }),
            ],
          );

while Example2 throws the Unexpected null value. error:

return ProfileScreen(
            providers: providers,
            actions: [
              SignedOutAction((context) {
                handleUserSignedOut();
                Navigator.pushReplacementNamed(context, '/');
              }),
            ],
          );

I find this confusing as the following example with SignInScreen works just fine:

return SignInScreen(
            providers: providers,
            actions: [
              AuthStateChangeAction<SignedIn>((context, state) {
                handleUserSignedIn();
                Navigator.pushReplacementNamed(context, '/');
              }),
            ],
          );