Describe what you were doing before the crash
[eg. Loading game, creating world, spawning a certain mob, hurting a mob, walking around]

I don't know how it happened the person who crash was a member of my server

Crash Log:
https://pastebin.com/L9VkhBbq
Versions:

• Minecraft Version: 1.16.1
• Forge Version: forge-1.16.1-32.0.108
• Mod Version: betteranimalsplus-1.16.1-9.0.1.3