Bug Report

Observed Behaviour
When I try to join my server I get kicked out with an "internal server error." Downgrading to tetra 3.4.0 fixes it.
Crash log (technically not a crash but the log is important): https://gist.github.com/ocram9/336016753365a47d6cf88814481ea007

Expected Behaviour
Being able to join my server.

Minimal setup needed to reproduce

• Forge version: 35.1.29
• Tetra version: 3.5.1
• Tetra configuration: https://gist.github.com/ocram9/179ac651a880dc9998a92f7ae120f2c6

Steps to reproduce

1. Start server with tetra 3.5.1
2. EDIT: Join a server
3. Take a Tetra item (like a hammer)
4. Get kicked with an "internal server error"

Should be fixed for real in 3.5.2!