ImmersiveEngineering-0.12-87
forge: various (14.23.5.2768, 14.23.5.2784, 14.23.5.2796)
No other mods.

Crash when opening the Engineer's Toolbox.

How to reproduce:
Create a new world.
Craft or cheat an Engineer's Toolbox.
Right click while on hand will crash the game, before the toolbox's gui appears.

ImmersiveEngineering-0.12-86 works fine.

immersive-debug.log
immersive-latest.log
immersive-crash-2018-12-18_11.28.22-server.txt

Ahh, sorry this has been reported and fixed for .88 release, did not see the closed issues when searching :P