Issue Description:

For some reason, after walking for a while in any world, my minecraft crashes.

What happens:

It just crashes.
crash-2018-05-01_01.50.37-server.txt

What you expected to happen:

Well, I expect it to work.

Steps to reproduce:

1. Open the game.
2. Walk for a bit.
3. Crash.

Affected Versions (Do not use "latest"):

• Pokecube Core: 6.36.7
• Pokecube Revival (if applicable): 4.7.0
• Pokecube Mobs (if applicable): 6.14.15
• Minecraft: 1.12.2
• Forge: 1.12.2-14.23.3.2677

workaround for now: in thutcore.cfg, turn multithreadedAI to false, seems that being on broke in 1.12.2, and I have not had time to fix it yet.