Version information

itemswapper-fabric-0.5.5-mc1.20.4

Other mods installed

jei-1.20.4-fabric-17.3.0.48

Reproduction Steps

Go into an inventory and press Shift or Esc and the game crashes if JEI is installed

Crash Report file

crash-2024-02-10_17.53.11-client.txt

Additional information

No response

The issue goes away if I uninstall ItemSwapper

Then you have some other crash. The one you sent is not ItemSwapper.

java.lang.NoClassDefFoundError: com/terraformersmc/modmenu/gui/widget/LegacyTexturedButtonWidget
at java.base/java.lang.ClassLoader.defineClass1(Native Method)

That has nothing to do with this mod, you are missing modmenu for whatever JEI is trying to do.