Bug Report

Observed Behaviour
Game crashed. java.util.ConcurrentModificationException: null

Crash log: https://pastebin.com/ZCjCbTgv

Expected Behaviour
No crash.

Minimal setup needed to reproduce

• Forge version: 1.15.2 forge-31.2.44
• Tetra version: tetra-1.15.2-2.18.1.jar
• Tetra configuration: default
• Other mods: (see full list in crash logs)

Steps to reproduce
Not sure, was browsing the holo gui under "Blades" category. May have clicked too quickly, not sure.

This should have been fixed in >3