Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel stable, 1.22.4, on Mac OS X 10.15.4 19E287 darwin-x64, locale en-US)
[✓] Android toolchain - develop for Android devices (Android SDK version 30.0.2)
[✓] Xcode - develop for iOS and macOS (Xcode 12.1)
[!] Android Studio (version 4.1)
    ✗ Flutter plugin not installed; this adds Flutter specific functionality.
    ✗ Dart plugin not installed; this adds Dart specific functionality.
[✓] IntelliJ IDEA Ultimate Edition (version 2020.3)
[✓] VS Code (version 1.51.1)
[!] Connected device
    ! No devices available
Plugin config:
final currentConfig = await bg.BackgroundGeolocation.state;
  Logger.debug('current bg geolocation config: ${currentConfig.toMap()}');
  bg.BackgroundGeolocation.ready(bg.Config(
          logLevel:
              isProd ? bg.Config.LOG_LEVEL_ERROR : bg.Config.LOG_LEVEL_VERBOSE,
          reset: true,
          url: "${EnvironmentConfig.API_URL}/api/courierLocation",
          httpRootProperty: '.',
          locationTemplate:
              '{"id":"<%= uuid %>","timeTakenUTC":"<%= timestamp %>","latitude":<%= latitude %>,"longitude":<%= longitude %>,"speedMeters":<%= speed %>,"isMoving":<%= is_moving %>}',
          params: {
            'deviceOs':
                '${Platform.operatingSystem}:${Platform.operatingSystemVersion}',
            'appBuild': '${packageInfo.version}:${packageInfo.buildNumber}'
          method: 'POST',
          desiredAccuracy: Platform.isIOS
              ? bg.Config.DESIRED_ACCURACY_NAVIGATION
              : bg.Config.DESIRED_ACCURACY_HIGH,
          stopTimeout: 5,
          stationaryRadius: 200,
          stopOnStationary: false,
          stopOnTerminate: false,
          startOnBoot: true,
          distanceFilter: Platform.isAndroid ? 0 : 200.0,
          elasticityMultiplier: 2,
          maxRecordsToPersist: 5,
          enableHeadless: true,
          notification: bg.Notification(
            sticky: true,
            smallIcon: 'mipmap/notification_icon',
            largeIcon: 'mipmap/notification_icon',
          showsBackgroundLocationIndicator: true, // ios only,
          locationAuthorizationRequest: 'Always',
          authorization: currentConfig.authorization,
          backgroundPermissionRationale:
              currentConfig.backgroundPermissionRationale,
          locationAuthorizationAlert: currentConfig.locationAuthorizationAlert,
          locationUpdateInterval: currentConfig.locationUpdateInterval,
          fastestLocationUpdateInterval:
              currentConfig.fastestLocationUpdateInterval))
      .then((bg.State state) {
    Logger.debug('Background geolocation ready: ${state.toMap()}');
Expected Behavior
The app shouldn't crash
Actual Behavior
We got the following crash report from the google play console pre launch report:
Fatal Exception: java.lang.NullPointerException: Attempt to invoke virtual method 'android.content.SharedPreferences android.content.Context.getSharedPreferences(java.lang.String, int)' on a null object reference
       at com.transistorsoft.tsbackgroundfetch.BackgroundFetchConfig$1.run(BackgroundFetchConfig.java)
       at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113)
       at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588)
       at java.lang.Thread.run(Thread.java:818)
Steps to Reproduce
Not sure. I tried to reproduce in the emulator but wasn't able to.
          
This comes from background_fetch, not background_geolocation and comes from Google simulating a crash.
See transistorsoft/flutter_background_fetch#61