Having a game error out is fairly normal for crappy games, but all of the operating systems run process in isolation. Mac, Linux, or Windows, a non core process failing should not cause a system crash.
You may want to stress test your setup, check your power supply. One of the issues with unoptimized games is that the load they put on the rig is odd and often extremely inconsistent. If your video card is spiking the power and your power supply is slow to adjust it can cause memory to get the equivalent of micro brownouts, leading to memory corruption. Having a bad memory sector in an area of memory that is not often utilized is another possible reason for the system to crash. Good luck.