6.0.1 - System.ObjectDisposedException (SendWebSocketMessageAsync)

My app suddenly went boom along with the following exception. Not entirely sure how/where to properly catch it.
Most probably during sending a Pong ( my app never actively send anything itself, only runs a subscription and receive events )

Description: The process was terminated due to an unhandled exception.
Exception Info: System.ObjectDisposedException
at System.Net.WebSockets.WebSocketBase.ThrowIfDisposed()
at System.Net.WebSockets.WebSocketBase+WebSocketOperation+d__19.MoveNext()
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(System.Threading.Tasks.Task)
at System.Net.WebSockets.WebSocketBase+d__47.MoveNext()
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(System.Threading.Tasks.Task)
at GraphQL.Client.Http.Websocket.GraphQLHttpWebSocket+d__39.MoveNext()
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(System.Threading.Tasks.Task)
at GraphQL.Client.Http.Websocket.GraphQLHttpWebSocket+d__38.MoveNext()
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(System.Threading.Tasks.Task)
at GraphQL.Client.Http.Websocket.GraphQLTransportWSProtocolHandler+<>c__DisplayClass7_1`1+<b__2>d[[System.__Canon, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089]].MoveNext()
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Threading.ExecutionContext.RunInternal(System.Threading.ExecutionContext, System.Threading.ContextCallback, System.Object, Boolean)
at System.Threading.ExecutionContext.Run(System.Threading.ExecutionContext, System.Threading.ContextCallback, System.Object, Boolean)
at System.Threading.QueueUserWorkItemCallback.System.Threading.IThreadPoolWorkItem.ExecuteWorkItem()
at System.Threading.ThreadPoolWorkQueue.Dispatch()