Crash when opening GUI

[Boolyman]

Describe the bug

Clicked wrench icon to open GUI, immediately causes a crash.

To Reproduce

1. Click wrench icon

Expected behavior

For it not to crash.

Mod Version

2.6.1

Minecraft Version

1.21.1

Modloader

NeoForge

Crash Log (if applicable)

https://pastebin.com/mta89hQp

Additional context

Thanks

[Hti-0683]

I had the same problem. The game crashed when I tried to click the configuration button for any mod without its own built-in configuration interface in Minecraft 1.21.1 and NeoForge 21.1.211.
Here is the crash log link: https://mclo.gs/9uSXAYT

[muggleorwizard]

mezz/JustEnoughItems#4113