Can the game with no mods/cc cause LEs?

Got one a couple of days ago when I changed a holiday's requirements, no mods or cc. It didn't cause any problems - the game handled the error just fine, and I wouldn't have known about it if I hadn't looked at my last exception errors. I've also got one from reading a 'beginner' gardening book, one involving a mysterious hamburger (which my Sims never eat) and one caused by an unnamed 'social interaction' that was evidently impossible.