Crash log link: http://pastebin.com/VZGLk7Mn

Problem: When placing vengence spirit box inside spirit furnace GUI this crash happens and player is unable to login until the furnace GUI block is removed.

Expected behaviour: It's supposed to burn the vengence spirit inside the furnace and leave loot like the forgotten player?

Steps to reproduce the problem:

• Make Spirit Furnace
• Place vengence spirit box inside Spirit Furnace GUI and crash occurs.

Forge 1907
EvilCraft-1.9-0.10.0.jar
CyclopsCore-1.9-0.6.0.jar