This is what the mod is for, if Neruina didn't kill what it killed, your game would have crashed. More specifically, it would have crashed and then your world would have bricked, which no one wants.

This is not a bug.

To stop Neruina from killing things, check your logs, or server logs if you're on a server, and the cause will be there, it is advisable to address it asap, Neruina is a quick fix bandage, it doesn't heal the wound.