[NEED HELP] Xonotic 0.8 completely froze my Mac a few times

Sometimes the game just freezes (the last frame is still displayed), and the only thing I can do is to restart my Mac. This is what I found in the system logs, and to be honest it sounds a little bit scary:

kernel[0]: process xonotic-osx-sdl-[325] thread 2170 caught burning CPU!; EXC_RESOURCE supressed due to audio playback

OS X 10.9.5, iMac(MB325LL/A) -- full technical specifications