Null check operator error

[MSF01]

Hi I am trying to save my location on Firebase RTDB but for some reason when I try to run it I get the runtime error of Null check operator used on a null value

try {
      BackgroundLocator.registerLocationUpdate(
        (LocationDto locationDto) async {
          // Handle location update
          saveLocation(locationDto);
        },
        initCallback: LocationCallbackHandler.initCallback,
        autoStop: false,
        androidSettings: const AndroidSettings(
          accuracy: LocationAccuracy.NAVIGATION,
          interval: 5,
          distanceFilter: 0,
          androidNotificationSettings: AndroidNotificationSettings(
              notificationChannelName: 'Location tracking',
              notificationTitle: 'Start Location Tracking',
              notificationMsg: 'Track location in background',
              notificationBigMsg:
                  'Background location is on to keep the app up-tp-date with your location. This is required for main features to work properly when the app is not running.',
              notificationIconColor: Colors.red,
              notificationTapCallback:
                  LocationCallbackHandler.notificationCallback),
        ),
      );
    } catch (e) {
      print('Exception Caught on fetching location: $e');
    }

And showing error like this

Pointing directly at

static Map<String, dynamic> _getCommonArgumentsMap(
      {required void Function(LocationDto) callback,
      void Function(Map<String, dynamic>)? initCallback,
      Map<String, dynamic>? initDataCallback,
      void Function()? disposeCallback}) {
    final Map<String, dynamic> args = {
      Keys.ARG_CALLBACK:
          PluginUtilities.getCallbackHandle(callback).toRawHandle(),
    };

    if (initCallback != null) {
      args[Keys.ARG_INIT_CALLBACK] =
          PluginUtilities.getCallbackHandle(initCallback)!.toRawHandle();
    }
    if (disposeCallback != null) {
      args[Keys.ARG_DISPOSE_CALLBACK] =
          PluginUtilities.getCallbackHandle(disposeCallback)!.toRawHandle();
    }
    if (initDataCallback != null) {
      args[Keys.ARG_INIT_DATA_CALLBACK] = initDataCallback;
    }

    return args;
  }