Issue description:
Clientside crash when I tried to open the GUI of a powercell

Steps to reproduce:

I tried to open a powercell GUI - https://hastebin.com/axohiqunuy.sql

Versions:

• Minecraft: 1.12.2
• Forge: 2705
• McJtyLib: 3.0.0-alpha
• RFTools: 7.50-alpha

Possibly incompatible mods and versions:

None of any that I'm aware, this is on the Enigmatica 2 Expert modpack.

Relevant logs, if any:

Crash report again - https://hastebin.com/axohiqunuy.sql

I ran into this crash as well; same exception, same stack trace. I was successfully opening Powercells in a previous version of Enigmatica 2 Expert, which used rftools-1.12-7.33.jar

Edit: Looks like we're behind the times and this will be fixed for the next RFTools release.
YaLTeR/MouseTweaks#7
McJtyMods/McJtyLib#74

Should be fixed as of the final release of 7.50. Please confirm.

This issue has been marked as needing a response from the reporter for over 2 weeks without receiving one. As such, it has been automatically closed.