Hi,

we get a lot of those Exception reports from the Unity SDK:

NullReferenceException: Object reference not set to an instance of an object.

Managed Stack Trace:

WebSocket4Net.WebSocket.ClearTimer () (at <00000000000000000000000000000000>:0)
WebSocket4Net.WebSocket.Close (System.Int32 statusCode, System.String reason) (at <00000000000000000000000000000000>:0)
WebSocket4Net.WebSocket.OnPingTimerCallback (System.Object state) (at <00000000000000000000000000000000>:0)
System.Threading.Timer+Scheduler.TimerCB (System.Object o) (at <00000000000000000000000000000000>:0)
System.Threading.ThreadPoolWorkQueue.Dispatch () (at <00000000000000000000000000000000>:0)

 Could this be related? https://github.com/kerryjiang/WebSocket4Net/issues/84

We are seeing the same issue since we have upgrade our project to Unity 2018.4