Trading with Villagers crashed the game

If I make custom Villagers in McEdit using Sethbling "CreateShops" filter and try to trade with them in 1.7, it doesn't show the trades and if I click on them, they crash my game. In 1.8 tough, is shows the trades, I can use them, but the Villager keeps getting new normal trades, wich i don't want. I send attached here the chrash report: