Internal Exeption

[WeAreBennixMC]

Description of the bug
So players are getting kicked when choosing a kit in the arena. I'm on 1.21.4 PaperMC.

Screenshot of /kp debug

Additional screenshots or video (if applicable)

Pastebin.com of any relevant .yml files (if applicable)

[WeAreBennixMC]

[cervinakuy]

Please include the full error stack trace from the console. These screenshots only show part of the error.

[WeAreBennixMC]

Sorry, there is absolutely 0 error from console. It only shows an error message to players.

I did find out what the problem is tho, but I don't know what causes it.

We use ViaVersion, when a player joins on the server version, so 1.21.4 nothing is wrong.

When a player joins on any version lower than that, the error happens. I am on the latest ViaVersion, so that won't be the problem. This only happens when selecting the kit.....

[cervinakuy]

Can you show me the last 150 lines of the console before a player is disconnected with an error like this?