Games crashes when my friend joins my MP Game

[DasBaum91]

salve,

since the new version of the game i have the problem that my game crashes as soon as someone joins my multiplayer games and i cant find any reason why it happens. I also tried the way around and told a buddy to host a game and joined him then...now he got the crash...
now i searched a bit for someone with the same problem but i cant find anything

 

[Had a dad]

register your game and then post in the MP section / tech support for the game in question