1.21 Neo variant crashes when clicking `Config` in the mods list

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Mod loader

NeoForge

Minecraft version

1.21

Mod version

15.1.5

Modloader version

NeoForge 21.0.148

Modpack info

No response

[IMPORTANT] If bug:

• [X] I have confirmed this bug is reproducible on a minimal setup, not a modpack with many other mods.

[IMPORTANT] If bug: The latest.log file, not the crash report

(Deleted)

Issue description

Crashes when clicking Config in the mods list