Version：1.18.2
First Aid：1.11.1
The-Hordes：1.18.2-1.2.1a.jar
Forge：40.2.10

I found that when the player was infected and died, missing a damage model caused the game to crash. Can you try to make it compatible?

crash-2024-01-04_15.38.36-server.txt

This doesn't look like it's fixable from this end, it would need to be fixed by first aids devs.