Since our usual friends weren't online, me and my friend thought it would be interesting to try out the bots and see how they act. We got ourselves our own team against two AI teams with two level 3 bots each, bringing the total count of hedgehogs to 24 (6 teams x 4 hedgehogs).

I created the LAN game. The first game went just as planned. But when we tried again Hedgewars kept crashing for him. After the first crash he got the following error dialog:
Last two engine messages:
Nu kör vi!
oops, queue error. in buffer: |(122600 > 122599)

This kept happening no matter what we tried. We restarted both my and his game, we tried with default game and weapon schemes, we tried different maps and themes. But every game just crashed for him, sometimes when his turn began, but also during any other team's turn. We couldn't see any pattern whatsoever. Eventually I asked him to send me the debug0.txt file so I could post it here. That log can be found here: http://pastebin.com/f82830da
He also mentioned that the buffer references were different for every crash. The log describes a later crash than the previously quoted error dialog message.

His PC:
AMD 64X2 5800+
ATI HD3870
Vista x64 SP1

My PC:
Intel C2D E6420
GeForce 8800GT
XP x86 SP3

We're both using Hedgewars 0.9.11.

Our first game with AI worked flawlessly though, and we've probably played more than 15 hours with other friends (without AI) the last couple of weeks without any kind of problem (with me creating a server/room/lobby everytime).
Please let me know if you need more information. Thanks for your time.