Edited villager trading crashed the game.

I was playing that crazy mash-up map "The Reef". I traded some End Portals and Eye of Enders with a villager, then it just all crashed. I guess you can edit the villager's trading options to make it crash the game somehow...?

What I expected to happen was...:
I don't know. There was nothing in the trade output.

What actually happened was...:
It errored and kicked me out of Minecraft.

Steps to Reproduce:
Go to the location where I was (x=-39.73, y=4.00, z=565.24), trade some End Portals and Eye of Enders with the villager.