'String' is not a subtype of type 'bool'

[darwin-morocho]

when the app is running and the user the user approaches the proximity sensor the next error is launched

flutter: map['isNear'] String
[VERBOSE-2:ui_dart_state.cc(148)] Unhandled Exception: type 'String' is not a subtype of type 'bool'
#0      IncallManager.eventListener (package:flutter_incall_manager/incall.dart:197:14)
#1      _rootRunUnary (dart:async/zone.dart:1132:38)
#2      _CustomZone.runUnary (dart:async/zone.dart:1029:19)
#3      _CustomZone.runUnaryGuarded (dart:async/zone.dart:931:7)
#4      _BufferingStreamSubscription._sendData (dart:async/stream_impl.dart:336:11)
#5      _DelayedData.perform (dart:async/stream_impl.dart:591:14)
#6      _StreamImplEvents.handleNext (dart:async/stream_impl.dart:707:11)
#7      _PendingEvents.schedule.<anonymous closure> (dart:async/stream_impl.dart:667:7)
#8      _rootRun (dart:async/zone.dart:1120:38)
#9      _CustomZone.run (dart:async/zone.dart:1021:19)
#10     _CustomZone.runGuarded (dart:async/zone.dart:923:7)
#11     _CustomZone.bindCallbackGuarded.<anonymous closure> (dart:async/zone.dart:963:23)
#12     _rootRun (dart:async/zone.dart:1124:13)
#13     _CustomZone.run (dart:async/zone.dart:1021:19)
#14     _CustomZone.runGuarded (dart:async/zone.dart:923:7)
#15     _CustomZone.bindCallbackGuarded.<anonymous closure> (dart:async/zone.dart:963:23)
#16     _microtaskLoop (dart:async/schedule_microtask.dart:41:21)
#17     _startMicrotaskLoop (dart:async/schedule_microtask.dart:50:5)
flutter: flutter: close video chat

this is my implementation

  @override
  void initState() {
    super.initState();
    incall.checkRecordPermission();
    incall.requestRecordPermission();
    incall.start({'media': 'audio', 'auto': true, 'ringback': ''});
  }
  @override
  void dispose() {
    incall.stop({'busytone': ''});
    super.dispose();
  }