@magge We have done the usual Sound related fixes, because audio was not working at first. So we deactivated any 3D sound settings and other fancy software like Steelseries Sonar. After that, sound was working for everyone.
I think it might be related to a script that was executed on that particular map. The crash happened at least once right after the event where the map increased in size for the first time, and at least once shortly after the second scripted event. The line you highlighted (nil value) could be the culprit, but I am not familar with lua and that code, so I can't be sure. I am familiar with a few other programming languages though, so if I can help in debugging in any way, let me know.
Again, thanks for looking into this!