Flutter FirebaseAuth crashes on hot restart - only on iOS

[abdullahriaz95]

Flutter FirebaseAuth crashes when I hot restart the app. The issue is only in iOS (i.e. Simulator and real device). Android works fine.

Also note: It works fine in release build iOS as well.

Following is my code.

main.dart

import 'package:flutter/material.dart';

import 'package:firebase_auth/firebase_auth.dart';
import 'package:firebase_core/firebase_core.dart';

void main() async {
  WidgetsFlutterBinding.ensureInitialized();
  await Firebase.initializeApp();

  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: MyDummyWidget(),
    );
  }
}

class MyDummyWidget extends StatefulWidget {
  @override
  _MyDummyWidgetState createState() => _MyDummyWidgetState();
}

class _MyDummyWidgetState extends State<MyDummyWidget> {
  @override
  Widget build(BuildContext context) {
    return Container(
      child: Center(
        child: StreamBuilder(
          initialData: null,
          stream: FirebaseAuth.instance.authStateChanges(),
          builder: (context, snapshot) {
            return Text('snapshot builder');
          },
        ),
      ),
    );
  }
}

pubspec.yaml

name: firebase_auth_test
description: A new Flutter project.

# The following line prevents the package from being accidentally published to
# pub.dev using `pub publish`. This is preferred for private packages.
publish_to: 'none' # Remove this line if you wish to publish to pub.dev

# The following defines the version and build number for your application.
# A version number is three numbers separated by dots, like 1.2.43
# followed by an optional build number separated by a +.
# Both the version and the builder number may be overridden in flutter
# build by specifying --build-name and --build-number, respectively.
# In Android, build-name is used as versionName while build-number used as versionCode.
# Read more about Android versioning at https://developer.android.com/studio/publish/versioning
# In iOS, build-name is used as CFBundleShortVersionString while build-number used as CFBundleVersion.
# Read more about iOS versioning at
# https://developer.apple.com/library/archive/documentation/General/Reference/InfoPlistKeyReference/Articles/CoreFoundationKeys.html
version: 1.0.0+1

environment:
  sdk: ">=2.7.0 <3.0.0"

dependencies:
  flutter:
    sdk: flutter
  firebase_core: ^1.1.0
  firebase_auth: ^1.1.3


  # The following adds the Cupertino Icons font to your application.
  # Use with the CupertinoIcons class for iOS style icons.
  cupertino_icons: ^1.0.2

dev_dependencies:
  flutter_test:
    sdk: flutter

# For information on the generic Dart part of this file, see the
# following page: https://dart.dev/tools/pub/pubspec

# The following section is specific to Flutter.
flutter:

  # The following line ensures that the Material Icons font is
  # included with your application, so that you can use the icons in
  # the material Icons class.
  uses-material-design: true

  # To add assets to your application, add an assets section, like this:
  # assets:
  #   - images/a_dot_burr.jpeg
  #   - images/a_dot_ham.jpeg

  # An image asset can refer to one or more resolution-specific "variants", see
  # https://flutter.dev/assets-and-images/#resolution-aware.

  # For details regarding adding assets from package dependencies, see
  # https://flutter.dev/assets-and-images/#from-packages

  # To add custom fonts to your application, add a fonts section here,
  # in this "flutter" section. Each entry in this list should have a
  # "family" key with the font family name, and a "fonts" key with a
  # list giving the asset and other descriptors for the font. For
  # example:
  # fonts:
  #   - family: Schyler
  #     fonts:
  #       - asset: fonts/Schyler-Regular.ttf
  #       - asset: fonts/Schyler-Italic.ttf
  #         style: italic
  #   - family: Trajan Pro
  #     fonts:
  #       - asset: fonts/TrajanPro.ttf
  #       - asset: fonts/TrajanPro_Bold.ttf
  #         weight: 700
  #
  # For details regarding fonts from package dependencies,
  # see https://flutter.dev/custom-fonts/#from-packages

Logs after hot-restart.

[+136018 ms] Skipping target: gen_localizations
[   +1 ms] complete
[   +1 ms] Performing hot restart...
[  +10 ms] Scanned through 511 files in 8ms
[        ] Syncing files to device iPhone 12 Pro...
[        ] <- reset
[        ] Compiling dart to kernel with 0 updated files
[        ] <- recompile package:firebase_auth_test/main.dart 99569910-3114-4ed2-9d55-f8825bc01e91
[        ] <- 99569910-3114-4ed2-9d55-f8825bc01e91
[  +72 ms] Updating files.
[  +38 ms] DevFS: Sync finished
[        ] Syncing files to device iPhone 12 Pro... (completed in 112ms)
[        ] Synced 25.5MB.
[        ] <- accept
[ +313 ms] Hot restart performed in 435ms.
[   +3 ms] Performing hot restart... (completed in 441ms)
[        ] Restarted application in 447ms.
[ +173 ms] Service protocol connection closed.
[        ] Lost connection to device.
[   +4 ms] DevFS: Deleting filesystem on the device
(file:///Users/apple/Library/Developer/CoreSimulator/Devices/19A89EB3-7E53-4C26-8F8D-4ABE2D61B2B8/data/Containers/Data/Application/4E4BE863
-335A-422C-B536-52B2BF9F20D1/tmp/firebase_auth_test1ivyLo/firebase_auth_test/)
[ +257 ms] Ignored error while cleaning up DevFS: TimeoutException after 0:00:00.250000: Future not completed
[   +5 ms] "flutter run" took 301,926ms.
[ +256 ms] ensureAnalyticsSent: 252ms
[   +1 ms] Running shutdown hooks
[        ] Shutdown hook priority 4
[   +3 ms] Shutdown hooks complete
[        ] exiting with code 0

192:ios apple$ flutter doctor -v
[✓] Flutter (Channel stable, 2.0.6, on macOS 11.2.3 20D91 darwin-x64, locale en-US)
    • Flutter version 2.0.6 at /Users/apple/Development/flutter
    • Framework revision 1d9032c7e1 (7 days ago), 2021-04-29 17:37:58 -0700
    • Engine revision 05e680e202
    • Dart version 2.12.3

[✓] Android toolchain - develop for Android devices (Android SDK version 30.0.3)
    • Android SDK at /Users/apple/Library/Android/sdk
    • Platform android-30, build-tools 30.0.3
    • Java binary at: /Applications/Android Studio.app/Contents/jre/jdk/Contents/Home/bin/java
    • Java version OpenJDK Runtime Environment (build 1.8.0_242-release-1644-b3-6915495)
    • All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS
    • Xcode at /Applications/Xcode.app/Contents/Developer
    • Xcode 12.5, Build version 12E262
    • CocoaPods version 1.10.1

[✓] Chrome - develop for the web
    • Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome

[✓] Android Studio (version 4.1)
    • Android Studio at /Applications/Android Studio.app/Contents
    • Flutter plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/9212-flutter
    • Dart plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/6351-dart
    • Java version OpenJDK Runtime Environment (build 1.8.0_242-release-1644-b3-6915495)

[✓] VS Code (version 1.55.2)
    • VS Code at /Applications/Visual Studio Code.app/Contents
    • Flutter extension version 3.22.0

[✓] Connected device (3 available)
    • sdk gphone x86 arm (mobile) • emulator-5554                        • android-x86    • Android 11 (API 30) (emulator)
    • iPhone 12 Pro (mobile)      • 19A89EB3-7E53-4C26-8F8D-4ABE2D61B2B8 • ios            • com.apple.CoreSimulator.SimRuntime.iOS-14-5 (simulator)
    • Chrome (web)                • chrome                               • web-javascript • Google Chrome 90.0.4430.93

• No issues found!