Immediate game crashes when joining a friend

[Shy_glizzy]

Doesn't matter who is joining who, when my friend tries to join my custom game it will immediately crash with no error message. Tried disabling firewall / Antivirus, local network hamachi, closing and opening game, restarting pc, etc. Joining servers works fine.

[Resxt]

Probably not same game (MP/ZM) or not same version