[google_sign_in] java.lang.NullPointerException: Attempt to read from field [...] on a null object reference

I found a following stack trace in my team's Crashlytics:

Fatal Exception: java.lang.NullPointerException: Attempt to read from field 'io.flutter.plugin.common.MethodChannel$Result io.flutter.plugins.googlesignin.GoogleSignInPlugin$Delegate$PendingOperation.result' on a null object reference
       at io.flutter.plugins.googlesignin.GoogleSignInPlugin$Delegate.finishWithSuccess(GoogleSignInPlugin.java:2)
       at io.flutter.plugins.googlesignin.GoogleSignInPlugin$Delegate.onSignInAccount(GoogleSignInPlugin.java:69)
       at io.flutter.plugins.googlesignin.GoogleSignInPlugin$Delegate.onSignInResult(GoogleSignInPlugin.java:8)
       at io.flutter.plugins.googlesignin.GoogleSignInPlugin$Delegate.access$000(GoogleSignInPlugin.java)
       at io.flutter.plugins.googlesignin.GoogleSignInPlugin$Delegate$1.onComplete(GoogleSignInPlugin.java:2)
       at com.google.android.gms.tasks.zzj.run(zzj.java:23)
       at android.os.Handler.handleCallback(Handler.java:883)
       at android.os.Handler.dispatchMessage(Handler.java:100)
       at com.google.android.gms.internal.tasks.zzb.dispatchMessage(zzb.java)
       at android.os.Looper.loop(Looper.java:237)
       at android.app.ActivityThread.main(ActivityThread.java:8167)
       at java.lang.reflect.Method.invoke(Method.java)
       at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:496)
       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1100)

One occurrence, app with ~1000 active users.

I had a quick look at the plugin's code in the location mentioned in the stack trace. result is passed through a few layers without a null-check. Maybe there's a reasonable (but rare) path when it actually can be null?

Hi @cubuspl42
Can you please provide your flutter doctor -v and pubpsec.yaml
Thank you

▶ flutter doctor -v
  ╔════════════════════════════════════════════════════════════════════════════╗
  ║ A new version of Flutter is available!                                     ║
  ║                                                                            ║
  ║ To update to the latest version, run "flutter upgrade".                    ║
  ╚════════════════════════════════════════════════════════════════════════════╝


[✓] Flutter (Channel stable, 1.22.3, on Mac OS X 10.14.6 18G6032, locale en-PL)
    • Flutter version 1.22.3 at /Users/jakub/Frameworks/flutter
    • Framework revision 8874f21e79 (3 months ago), 2020-10-29 14:14:35 -0700
    • Engine revision a1440ca392
    • Dart version 2.10.3


[✓] Android toolchain - develop for Android devices (Android SDK version 29.0.3)
    • Android SDK at /Users/jakub/Library/Android/sdk
    • Platform android-29, build-tools 29.0.3
    • 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-b3-6222593)
    • All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS (Xcode 11.2.1)
    • Xcode at /Applications/Xcode.app/Contents/Developer
    • Xcode 11.2.1, Build version 11B500
    • CocoaPods version 1.10.0

[!] Android Studio (version 4.0)
    • Android Studio at /Applications/Android Studio.app/Contents
    ✗ Flutter plugin not installed; this adds Flutter specific functionality.
    ✗ Dart plugin not installed; this adds Dart specific functionality.
    • Java version OpenJDK Runtime Environment (build 1.8.0_242-release-1644-b3-6222593)

[!] IntelliJ IDEA Ultimate Edition (version 2020.3)
    • IntelliJ at /Applications/IntelliJ IDEA.app
    ✗ Flutter plugin not installed; this adds Flutter specific functionality.
    ✗ Dart plugin not installed; this adds Dart specific functionality.
    • For information about installing plugins, see
      https://flutter.dev/intellij-setup/#installing-the-plugins

[✓] IntelliJ IDEA Community Edition (version 2020.3.1)
    • IntelliJ at /Applications/IntelliJ IDEA CE.app
    • Flutter plugin installed
    • Dart plugin version 203.6912

[!] VS Code (version 1.47.3)
    • VS Code at /Applications/Visual Studio Code.app/Contents
    ✗ Flutter extension not installed; install from
      https://marketplace.visualstudio.com/items?itemName=Dart-Code.flutter

[!] Connected device
    ! No devices available

! Doctor found issues in 4 categories.

version: 0.1.0+0

environment:
  sdk: ">=2.6.0 <3.0.0"

dependencies:
  flutter:
    sdk: flutter

  flutter_localizations:
    sdk: flutter

  # The following adds the Cupertino Icons font to your application.
  # Use with the CupertinoIcons class for iOS style icons.
  cupertino_icons: ^1.0.0

  pedantic: ^1.8.0
  flutter_facebook_login: ^3.0.0
  sign_in_with_apple: ^2.1.0+1
  firebase_auth: ^0.20.0
  flutter_svg: ^0.19.0
  carousel_slider: ^2.0.0
  http: ^0.12.0+1
  google_sign_in: ^4.0.1+1
  googleapis: ^0.56.0
  test: ^1.5.3
  shared_preferences: ^0.5.2
  quantity: ^1.0.0
  url_launcher: ^5.0.2
  dartz: ^0.9.1
  csv: ^4.0.3
  package_info: ^0.4.0+4
  device_info: ^1.0.0
  firebase_crashlytics: ^0.4.0
  firebase_core: ^0.7.0
  uuid: ^2.0.2
  meta: ^1.1.6
  firebase_dynamic_links: ^0.7.0
  rxdart: ^0.25.0
  cloud_firestore: ^0.16.0
  cloud_functions: ^0.9.0
  firebase_analytics: ^7.0.0
  firebase_performance: ^0.5.0
  firebase_remote_config: ^0.6.0
  intl: ^0.16.1
  intl_translation: ^0.17.7
  flutter_hooks: ^0.15.0
  more: ^2.2.0
  share: ^0.6.5
  expandable: ^4.0.1
  flutter_keyboard_visibility: ^4.0.0
  flutter_markdown: ^0.5.0
  collection: ^1.14.11
  animated_widgets: ^1.0.3
  charts_flutter: ^0.9.0
  crypto: ^2.1.3
  pub_semver: ^1.4.2
  device_preview: ^0.5.4
  visibility_detector: ^0.1.4
  cached_network_image: ^2.0.0
  flutter_blurhash: ^0.5.0
  in_app_purchase: ^0.3.3
  step_progress_indicator: ^0.2.1
  synchronized: ^2.2.0
  lottie: ^0.7.0
  animations: ^1.1.1
  freezed_annotation: ^0.12.0
  memoize: ^2.0.0
  app_review: ^2.0.0
  stack_trace: ^1.9.5
  video_player: ^1.0.0
  chewie: ^0.12.0
  path_provider: ^1.6.14
  firebase_storage: ^7.0.0
  wakelock: ^0.2.1
  simple_gesture_detector: ^0.1.4
  fit_kit: ^1.1.2
  permission_handler: ^5.0.1+1
  retry: ^3.0.1
  google_api_availability: ^2.0.4
  modal_progress_hud: ^0.1.3
  worker_manager: ^3.2.5
  android_play_install_referrer: ^0.0.4

dependency_overrides:
  platform: 3.0.0-nullsafety.2

dev_dependencies:
  flutter_test:
    sdk: flutter

  flutter_driver:
    sdk: flutter

  flutter_launcher_icons: ^0.8.0
  mockito: ^4.0.0

  build_runner: ^1.10.1
  freezed: ^0.12.0
  json_serializable: ^3.2.0
  flutter_gen: ^1.2.1

flutter_icons:
  android: true
  ios: true
  image_path_android: "icons/android.png"
  image_path_ios: "icons/ios.png"

flutter_gen:
  integrations:
    flutter_svg: true

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

# The following section is specific to Flutter.
flutter:
  fonts:
    - family: WorkSans
      fonts:
        - asset: fonts/WorkSans-Regular.ttf
        - asset: fonts/WorkSans-Light.ttf
          weight: 300
        - asset: fonts/WorkSans-Medium.ttf
          weight: 500
        - asset: fonts/WorkSans-Bold.ttf
          weight: 700
    - family: Roboto
      fonts:
        - asset: fonts/Roboto-Regular.ttf

  # 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

Hi @cubuspl42
You seem to be using an old version of google_sign_in and an older Flutter stable channel.
Please upgrade your google_sign_in and flutter channel to the latest stable releases.
flutter channel stable
flutter upgrade --force
flutter doctor -v

If the problem persists, provide the UPDATED futter doctor -v and pubspec.yaml.
Thank you

Latest non-prerelease version of google_sign_in: 4.5.9

My version from pubspec.lock:

  google_sign_in:
    dependency: "direct main"
    description:
      name: google_sign_in
      url: "https://pub.dartlang.org"
    source: hosted
    version: "4.5.9"

...so it's the newest.

Please note that the stack trace comes from production, from Crashlytics. It's a fatal crash. The production build is built on CI/CD, with a relatively new Flutter framework version. So my local flutter doctor output doesn't matter. But anyway, I really don't think that a non-ancient Flutter framework can be responsible for a NullPointerException inside io.flutter.plugins.googlesignin.GoogleSignInPlugin!

I just confirmed that my team uses Flutter 1.22.5 on CI/CD.

[google_sign_in] Redesign API for current identity SDKs (flutter#9267)

This thread has been automatically locked since there has not been any recent activity after it was closed. If you are still experiencing a similar issue, please open a new bug, including the output of flutter doctor -v and a minimal reproduction of the issue.

[google_sign_in] Redesign API for current identity SDKs (flutter#9267)

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[google_sign_in] java.lang.NullPointerException: Attempt to read from field [...] on a null object reference #74308

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