[Getai Campaign] Automatic PC reboot when a battle starts

I've recently started the Getai campaign and attacked the nearby settlement. After 4 turns the enemy sallied out, but when the battle started, my PC automatically rebooted after 2-3 seconds. I tried 4 times and it was always the same. I checked some custom battles and they work fine, e.g. no crashes or automatic reboots. I started the game as Macedonia and randomly attacked the nearby rebel general and everything was fine there, too.

Here is the save game.
https://dl.dropboxusercontent.com/u/...1/Autosave.sav

Ran it, completed the battle successfully. Don't know what's different for you, but just in case, I'm running with a disc install.