When ever a horde attacks a village, sometimes the guards will die and turn into zombie villager, the guards being from the Guard Villager mod, and it will crash the server. For now I've turned off the infection for villagers until it's fixed ^-^
https://pastebin.com/0wALCvi1

I haven't been able to get this crash to happen, which versions of the hordes and guard villagers do you have installed?
Also what other mods do you have installed?

We have... a lot of mods XD one sec
https://www.curseforge.com/minecraft/modpacks/moonlitmyths/relations/dependencies
Forge 40.2.0
Guard Villagers guardvillagers-1.18.2.1.4.3.jar
Hordes The-Hordes-1.18.2-1.1.5e.jar

If you're still having this issue, update apotheosis if you can, and see if the error is still happening.