setState() called after dispose: _QuestionsPageState#135cb(lifecycle state: defunct, not mounted)

[samvit-refyne]

My firebase crashlytics is flooded by these kind of errors, every time a survey is submitted, this error is shown. Its a Non-Fatal exception but populates crashytics/sentry dashboards with errors.

Fix is added in this PR #4

flutter doctor -v :

[✓] Flutter (Channel stable, 3.7.7, on macOS 13.1 22C65 darwin-arm64, locale en-IN)
    • Flutter version 3.7.7 on channel stable at /Users/samvitchrungoo/flutter
    • Upstream repository https://github.com/flutter/flutter.git
    • Framework revision 2ad6cd72c0 (6 weeks ago), 2023-03-08 09:41:59 -0800
    • Engine revision 1837b5be5f
    • Dart version 2.19.4
    • DevTools version 2.20.1

[✓] Android toolchain - develop for Android devices (Android SDK version 33.0.1)
    • Android SDK at /Users/samvitchrungoo/Library/Android/sdk
    • Platform android-33, build-tools 33.0.1
    • Java binary at: /Applications/Android Studio.app/Contents/jbr/Contents/Home/bin/java
    • Java version OpenJDK Runtime Environment (build 11.0.15+0-b2043.56-8887301)
    • All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS (Xcode 14.2)
    • Xcode at /Applications/Xcode.app/Contents/Developer
    • Build 14C18
    • CocoaPods version 1.12.0

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

[✓] Android Studio (version 2022.1)
    • 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 11.0.15+0-b2043.56-8887301)

[✓] VS Code (version 1.74.3)
    • VS Code at /Users/samvitchrungoo/Downloads/Visual Studio Code.app/Contents
    • Flutter extension version 3.60.0

[✓] Connected device (2 available)
    • macOS (desktop) • macos  • darwin-arm64   • macOS 13.1 22C65 darwin-arm64
    • Chrome (web)    • chrome • web-javascript • Google Chrome 112.0.5615.137

[✓] HTTP Host Availability
    • All required HTTP hosts are available

Crashlytics Stacktrace

 Crashlytics - Stack trace
 Application: in.co.XXXXX.android
 Platform: android
 Version: 1.9.1 (91)
 Issue: fc5e43b931d864c57094ddf101616b0d
 Session: 643E6326030E00016E164470B3372987_DNE_0_v2
 Date: Tue Apr 18 2023 15:01:16 GMT+0530 (India Standard Time)

Non-fatal Exception: io.flutter.plugins.firebase.crashlytics.FlutterError: Null check operator used on a null value. Error thrown null.
       at State.setState(framework.dart:1134)
       at _QuestionsPageState.generateQuestionList(eui.dart:453)
       at _QuestionsPageState._handleNextQuestion(eui.dart:537)
       at _QuestionsPageState.storeAnswers.<fn>(eui.dart:260)

[hemanath-ss]

++ @sachin-kumar56

[Gokulkrishna-Raju]

Fixed, latest version is updated with the fix.