What happened?

error

The game crashed whilst container clickError: java.lang.NullPointerException: Cannot invoke "net.minecraft.class_1799.method_7947()" because "material" is null

when placing an item on the anvil

BCLib

bclib-21.0.3

WorldWeaver

worldweaver-21.0.4.

Fabric API

fabric-api-0.100.1+1.21

Fabric Loader

1.21 (0.16.2)

Minecraft

1.21

Relevant log output

No response

Other Mods

I am using the better end mod and world weaver