Cannot read property 'this._transport._transport' of undefined

[dragnet]

You have a mistake in conditions:

const transportOpen = this._transport &&
      this._transport._transport &&
      this._transport._transport.readyState === this._transport._transport.OPEN;

this._transport._transport of undefined

Need change to:

const transportOpen = this._transport && this._transport.readyState === this._transport.OPEN;

[FZambia]

@dragnet thanks a lot!

The reason is in difference between SockJS and Websocket - I've tested changes using only SockJS transport. Will try to add more tests in future but just don't have enough time for this :(

I believe that the problem should be fixed by 4102f04, already released 2.1.1 with this change. Could you try it and check that it works properly for you now?

[dragnet]

yes, it works correct for now, thanks, Alexander, you reacted very quickly