Luckily this doesn't happen too often

crash-2024-02-26_18.16.39-server.txt

What's your modloader? I see you have connector installed. If you're using fabric your game crashing is more than likely due to our mod not being compatible with connector

Hey, we're using Forge. This crash luckily doesn't occur often and only happens if certain aspects of Illager Revolution interact with Improved Mobs