[ERROR:flutter/lib/ui/ui_dart_state.cc(209)] Unhandled Exception: FormatException: Unexpected character (at character 2) {id: e74d8c82-626c-419b-b393-ab6bddcb093e, presenceType: Away

[lucasjinreal]

[ERROR:flutter/lib/ui/ui_dart_state.cc(209)] Unhandled Exception: FormatException: Unexpected character (at character 2)
{id: e74d8c82-626c-419b-b393-ab6bddcb093e, presenceType: Away, type: Presen...
 ^

#0      _ChunkedJsonParser.fail (dart:convert-patch/convert_patch.dart:1405:5)
#1      _ChunkedJsonParser.parse (dart:convert-patch/convert_patch.dart:935:48)
#2      _parseJson (dart:convert-patch/convert_patch.dart:40:10)
#3      JsonDecoder.convert (dart:convert/json.dart:506:36)
#4      JsonCodec.decode (dart:convert/json.dart:157:41)
#5      jsonDecode (dart:convert/json.dart:96:10)
#6      new MqttOnlineReader.<anonymous closure> (package:flutter_mqtt/MqttImpl/MqttOnlineReader.dart:31:41)
#7      _rootRunUnary (dart:async/zone.dart:1436:47)
#8      _CustomZone.runUnary (dart:async/zone.dart:1335:19)
#9      _CustomZone.runUnaryGuarded (dart:async/zone.dart:1244:7)
#10     _BufferingStreamSubscription._sendData (dart:async/stream_impl.dart:341:11)
#11     _DelayedData.perform (dart:async/stream_impl.dart:591:14)
#12     _StreamImplEvents.handleNext (dart:async/stream_impl.dart:706:11)
#13     _PendingEvents.schedule.<anonymous closure> (dart:async/stream_impl.dart:663:7)
#14     _rootRun (dart:async/zone.dart:1420:47)
#15     _CustomZone.run (dart:async/zone.dart:1328:19)
#16     _CustomZone.runGuarded (dart:async/zone.dart:1236:7)
#17     _CustomZone.bindCallbackGuarded.<anonymous closure> (dart:async/zone.dart:1276:23)
#18     _rootRun (dart:async/zone.dart:1428:13)
#19     _CustomZone.run (dart:async/zone.dart:1328:19)
#20     _CustomZone.runGuarded (dart:async/zone.dart:1236:7)
#21     _CustomZone.bindCallbackGuarded.<anonymous closure> (dart:async/zone.dart:1276:23)
#22     _microtaskLoop (dart:async/schedule_microtask.dart:40:21)
#23     _startMicrotaskLoop (dart:async/schedule_microtask.dart:49:5)

when sending image