Crash: Rendering Screen

My minecraft crashed

What I expected to happen was...:
To trade with my custom over powered villager i made in MC edit

What actually happened was...:
found an empty trade, then crashed after.

Steps to Reproduce:
1. Go to MCedit
2. make a villager with a diamond sword enchanted 30000 in 1.5 with Seths create shop filter in MC edit
3. trade once then look at next trade,
4.Crash!