I was working on a map and made a custom villager shop with sethblings mcedit filter and I realized I messed up afterwards with one of the items. So I tried to trade with the villager to get back the item and it instantly crashed the game. Afterwards I launched it again and the same thing happened.

I've also discovered that the area around the villager won't save either. This is troublesome because I'm still making the map and so I can't go on any further in that area.