Describe the bug
Had a crash trying to log into a world, it can sometimes be reproduced, and other times I can just log in fine.

To Reproduce
Can provide world download on request, this is a modified Gregblock pack version 1.1.3 (modified by adding OpenBlocks Elevators). I just try to login and the client crashes.

Expected behavior
Not to crash.

Additional context
https://gist.github.com/Vyraal1/795dbba68707153a39d30d1e4c19cdfe

Environment
SMP, AE2-rv6-Stable 1, GregBlock Ver 1.1.3

• Minecraft Version: 1.12.2
• Forge Version: 2768

I do not see any obvious reason for it. It is also crashing inside actual minecraft code, which we do not touch at all. Therefore could you try and reproduce it with less mods? Especially "performance" optimizing ones, as they might alter the particle system of minecraft.

So the current performance enhancing mods I could identify were BetterFPS and FoamFix, although I'm not sure of the latter's involvement in anything graphic related. I actually can't seem to reproduce the crash anymore, as it does seem to be random, sorry if this isn't helpful. I'll try to keep an eye out, it's just that I had this crash happen multiple times after assembling a somewhat large base with multiple facades.