Occasional crash on android devices

[st-jwerner]

Hello, we were going over crash statistics for our app and noticed that signalr may be the cause of couple crash reports. We are still using version v0.1.2 because we had some problems when we tried to update it (See #49). Unfortunately since we are only going off of androids built in crash reporting all we have is the following:

Exception java.lang.IllegalStateException: Reply already submitted
  at io.flutter.embedding.engine.dart.DartMessenger$Reply.reply (DartMessenger.java)
  at io.flutter.plugin.common.MethodChannel$IncomingMethodCallHandler$1.error (MethodChannel.java)
  at dev.asdevs.signalr_flutter_appbundle.SignalR.invokeServerMethod$lambda$22$lambda$21 (SignalR.java)
  at dev.asdevs.signalr_flutter_appbundle.SignalR.lambda$QoVwa0wbfnRczJxZNQArsoNu7Ho (SignalR.java)
  at dev.asdevs.signalr_flutter_appbundle.-$$Lambda$SignalR$QoVwa0wbfnRczJxZNQArsoNu7Ho.run (-.java)
  at android.os.Handler.handleCallback (Handler.java:942)
  at android.os.Handler.dispatchMessage (Handler.java:99)
  at android.os.Looper.loopOnce (Looper.java:226)
  at android.os.Looper.loop (Looper.java:313)
  at android.app.ActivityThread.main (ActivityThread.java:8741)
  at java.lang.reflect.Method.invoke (Method.java)
  at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run (RuntimeInit.java:571)
  at com.android.internal.os.ZygoteInit.main (ZygoteInit.java:1067)

any help would be much appreciated!