After i've left one server, i want to join another in a few seconds.

After join on the new server, the screen says "remote closed connection". Before i was able to click the button, there was the "do you want to download the resourcepack" screen. Then minecraft crashed.

I think the connection to the old server hasn't been closed correctly. Sometimes, if you connect very fast to a new server, you can read the chat from the old server(new messages, not from log)