classes are broken

[Angeluuus]

Describe the bug

when i select a class i get everytime errors in my console and i cant level my skills.

when i dont select a class i can level every skills and dont get errors

How to reproduce

select a class and try something

Screenshots / Videos

No response

Server Log

https://mcpaste.io/1c0d879057722fcf

[tenshik666]

I encountered the same problem when trying to customize the classes.

https://mcpaste.io/f9459074d7ae6107

[Angeluuus]

the bug is still there in 1.21.10