I managed to fix it by resetting unlocked chapters, i have no idea if this is the ultimate fix but atleast it worked

I have no idea why, but all of a sudden my game started crashing whenever i touch a turret, pick up a turret or a turret activates. This doesn't happen on the regular game, only on the source unpack. It worked just fine until now but all of a sudden it just started crashing. Any help?