When any pokemon evolves in a server it crashes it entirely, kinda all the info i got but my friends and I have tested multiple times that it is evolutions crashing the server. Doesnt matter the pokemon, battle or not, the server will forcibly close upon any evolution of any pokemon.

Crash log would be helpful, but the cause of this error is typically you're using a broken version of 8.2.0 I recommend redownloading 8.2 from our site https://reforged.gg and installing that on to your server (and remove the old 8.2.0). Let me know if this fixes it.