subscribing to several subscriptions throws an InvalidOperationException

[pdufrene]

Hi,

I am using version 3.1.3 of GraphQLClient and in my code I am subscribing to several subscriptions:

var stream1= graphQLClient.CreateSubscriptionStream<JToken>(new GraphQLRequest { Query = query1, WebSocketExceptionHandler);
subscription1 = stream1.Subscribe(stream1OnNext);

var stream2= graphQLClient.CreateSubscriptionStream<JToken>(new GraphQLRequest { Query = query2, WebSocketExceptionHandler);
subscription2 = stream2.Subscribe(stream2OnNext);

And when I execute this I receive the following exception:

System.InvalidOperationException
  HResult=0x80131509
  Message=There is already one outstanding 'SendAsync' call for this WebSocket instance. ReceiveAsync and SendAsync can be called simultaneously, but at most one outstanding operation for each of them is allowed at the same time.
  Source=System
  StackTrace:
   at System.Net.WebSockets.WebSocketBase.<SendAsyncCore>d__47.MoveNext()

When the second call to CreateSubscriptionStream is made.

If I debug step by step, it's working fine. How could I know that the web socket is ready?