The server I play on with a few friends experiences occasional crashes, specifically when a player is using Waystones to teleport to somewhere else.

Crashlog is here

The stacktrace implicates WildfireGender, I'm afraid, due to a nullpointer exception
I'm fairly sure it could be fixed pretty quickly by inserting a null check for trackers here:

https://github.com/WildfireRomeo/WildfireFemaleGenderMod/blob/neoforge-1.20.4/src/main/java/com/wildfire/main/WildfireGender.java#L121