IceandFire Community Edition

For the life of me I can't find a solution to this problem, so I'm hoping someone here might be able to help.

I added the IceandFire community edition mod to my mod pack. Everything seems to run fine. Fought a dragon, mined some ores, made some equipment, all fine. But when I place a beastiay lectren and try to interact with it, the game crashes. I don't get it. Of all the things in this mod, opening a small menu breaks it?

Can anyone help?