Steps to Reproduce the Bug

1 ctrl click to enable cheat mode in JEI
2 select any item to spawn
3 crash

Expected Behavior

followling steps with out crashing you should be able to spawn in items in creative mode

Actual Behavior

trying to give yourself items crashes your game

Mod Pack URL (Optional)

No response

Mod Pack Version (Optional)

No response

Extra Notes (Optional)

No response

latest.log

https://gist.github.com/IamGallito/7037d68df7bac841b465f9ff396b368e

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Thanks for the report!
Can you please try this with only JEI installed, to see if there is another mod causing a conflict here?