When a mob makes a child mob that has a growth value, the game/server crashes.
The following file contains the crash report and stacktrace
crash.txt

I have the same issue on a multiplayer server with my friends, it basically means we either have to get rid of pehkui altogether or not breed animals.

its been fixed in the latest update check the fixes in the new version of pehkui or immersive portals i forgot which one