Steps to Reproduce the Crash

start world in creative
toggle cheat mode in GUI for JEI
crash after
gist of crash attached

Mod Pack URL (Optional)

No response

Mod Pack Version (Optional)

No response

Extra Notes (Optional)

No response

Crash Report

https://gist.github.com/IamGallito/118b76f3376acad0b3d37a01b077912c

Thanks for the report!
This appears to be the same as #3460
I will merge these two issues together, please take discussion to the other issue.