Found the source! Long story short, my co-op partner reinstalled and I made a new package of the mods we were using. Solved.The title is just a crash, it could be anywhere in the game. You can only tell if you have the same crash if the fault offset is the same.
Once the next patch hits and we have crash reporting, these hard to reproduce crashes should start getting fixed. That said, it is possible we know about your specific crash and have it fixed in an upcoming patch. It is just hard to tell.