General Information
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• I play...
  • With a large modpack
  • Only with CQR and it's dependencies
• The issue occurs in...
  • Singleplayer
  • Multiplayer
• I have searched for this or a similar issue before reporting and it was either (1) not previously reported, or (2) previously fixed and I'm having the same problem.
• I am using the latest version of the mod (all versions can be found on github under releases)
• I read through the FAQ and I could not find something helpful (FAQ)
• I reproduced the bug without any other mod's except forge, cqr and it's dependencies
• The game crashes because of this bug

Describe the bug
When going back from Nether into Overworld in singleplayer the game sometimes crashes. It's happening on Cleanroom instance and the presence of Fugue and Scalar mods doesn't change anything. From my tests it seems that crash is gone when on dedicated server.

To Reproduce
Steps to reproduce the behavior:

1. Create singleplayer world
2. Go to Nether
3. Go back through portal into Overworld
4. Repeat process until crash happen

Screenshots

Versions (Note that 'latest' is NOT a valid version!
Chocolate Quest Repoured: 2.7.1B
Forge: 14.23.5.2860
Minecraft: 1.12.2
Other mods (necessary to reproduce the bug):
Cleanroom: 0.3.13-alpha
GeckoLib: 3.0.31
Reach Fix: 1.1.3

Log File
https://gist.github.com/sayys-ouro/b4ff35f65b70801124287c258fc8256a

Fixed in 4f96dfd, just not published yet.