Every time im opening the skills screen with pressing the button the game freezes and crashes afterwords.
Playing Forge 1.20.1 with other mods

did you ever find a fix for this? everyone in my server is crashing when they open the skill tree. im running 1.20.1 aswell

I'm dealing with the same issue as well. I listed a crash report here to be of more help to the mod author
crash-2024-01-13_13.58.29-client.txt

I got the same issue, and im using minecraft 1.20.1 aswell, its my own modpack

I got same, game crashes only on server. In single player i got artifact when oppening skill tree (black borders on screen). It causes only when Optifine is installed.

It is caused be an incompatibility with OptiFine which was recently fixed in mod version 0.11.3. Updating to that version should fix the problem.