My server crashes when my friend joins.

I use to just start my own 2 player slot server and play with my friend. My game just recently started to crash every time he joins. The little message on the right of the screen says “Player Payne joined the game” and all of a sudden everything freezes and I see my mouse cursor. The only way I can get out of this is by restarting my computer. The latest file I downloaded was the svn version of Gcombat and this… Help would be appreciated.

I got this problem too
Just run a dedicated server, look up a tutorial on youtube how to.