1. I won't call you a lying sack of shit, because that's a personal attack and I don't even know you - but the variable gets set BY THE GAME when it detects certain very well known mods, so if you didn't use a mod, then you're (probably) lying, or a lazy sack of (wait, I'm doing it again) using somebody else's saves, and they did.
2. It's not a crash. It's never a fucking crash. It's a specific exit point coded by DPC, and he's done it in almost every fucking episode for years, because he's tired of people modding the game and then asking him for support when they inevitably fuck shit up.