When a certain person joins the server just ,,hungs up". I don't know what he is doing but he connects to the server for the first time on some random account and it crashes server. Only he is doing this by simply joining the server. Log is in attachment. (First part is after i banned him, and second before he was banned) Is there something I can do to prevent this? His nick is MajtexPL and he joined on other nicknames and IP's.