Exception has occurred. StateError (Bad state: Future already completed) about signalr_core

[misici234]

@joeyyy688 why did you close this issue when it's not resolved? Please reopen it.

[wolnynick]

@joeyyy688 have you find a solution?

[misici234]

I have
signalr_core: ^1.1.1
in my pubspec.yaml file and I'm getting the same error but from another place in the code

Bad state: Future already completed
#0      _AsyncCompleter.complete (dart:async/future_impl.dart:45:31)
#1      HubConnection._processHandshakeResponse (package:signalr_core/src/hub_connection.dart:778:25)
#2      HubConnection._processIncomingData (package:signalr_core/src/hub_connection.dart:682:14)
#3      ServerSentEventsTransport.connect.<anonymous closure> (package:signalr_core/src/transports/server_sent_events_transport.dart:80:17)
#4      _rootRunUnary (dart:async/zone.dart:1436:47)
#5      _CustomZone.runUnary (dart:async/zone.dart:1335:19)
#6      _CustomZone.runUnaryGuarded (dart:async/zone.dart:1244:7)
#7      _BufferingStreamSubscription._sendData (dart:async/stream_impl.dart:341:11)
#8      _DelayedData.perform (dart:async/stream_impl.dart:591:14)
#9      _StreamImplEvents.handleNext (dart:async/stream_impl.dart:706:11)
#10     _PendingEvents.schedule.<anonymous closure> (dart:async/stream_impl.dart:663:7)
#11     _rootRun (dart:async/zone.dart:1420:47)\n#12 ...

It fails on statement
_handshakeCompleter.complete();
in the _processHandshakeResponse function. You have already fixed in as

    if (!_handshakeCompleter.isCompleted) {
      _handshakeCompleter.complete();
    }

but in _connectionClosed function. I think you just need to do the same thing in _processHandshakeResponse.
Can you please fix it soon?

[joeyyy688]

@misici234 I haven't tried it again since I faced this error, once you've found the solution I've closed this issue. Thank you