Did you edit the basic.cfg when you were in the middle of a patrol? That's the only reason I can think of for a CTD, changing the value in that line from 0 to some other number shouldn't do it. But almost all modding needs to be done only when you are safely in base otherwise your saved games for the current patrol may crash out on you.
Unless something accidentally got changed in the basic.cfg that you didn't intend to change and got saved into the new version.
