Connection to not exitsitng Server produces NullReferenceException

[gratinierer]

If the Server is not reacheable, a NullReference is thrown

System.AggregateException : One or more errors occurred. (Object reference not set to an instance of an object.)
  ----> System.NullReferenceException : Object reference not set to an instance of an object.
   at Innovator.Client.Utils.Rethrow(Exception ex)
   at Innovator.Client.Promise`1.get_Value()
   at Innovator.Client.Connection.ArasHttpConnection.Login(ICredentials credentials)