Description of the issue:

Hooking up a rope/wire works fine, but the opposite direction crashes the game with index out of bounds exception

Crashlog:

https://gist.github.com/Efimero/70064e7e9d2ba4c83bd758069b197a76

Versions & Modlist

IE: 0.12.48 (and 46)
Minecraft: 1.12.2
Forge: 2708
Pack: Enigmatica 2 skyblock

CANNOT REPRODUCE ON VANILLA SETUP
sorry, it's something with the pack, but the error comes from IE

Known and fixed for the next build of IE.