In multiplayer going home early crashes the game to desktop

[Sweeper5]

If you hit TAB or use the statue in the office to go home early in multiplayer, the game will CTD (Crash To Desktop)
However the game will still progress for the other player without any notification as to what has happened.

Another multiplayer issue is the documentation, if you are to play this you will need to forward 2 ports in your router to make it work:
41234
41235
I am guessing for UDP based on what I found out regarding this new solution for networking, but I forwarded TCP and UDP and it works like a charm for multiplayer, this is for the host only though.
These port numbers are mentioned in the source code only, so it took me a while to dig them out and convert them from Hex to normal numbers.