I was testing the pondering feature and was watching the deployer one, towards the end of it, my game froze, then saved, then closed with a crash message:
The game crashed whilst ticking screen
Error: java.lang.NullPointerException: Ticking screen
Exit Code: -1
It happens right as the pink sheep is placed to be sheered, it freezes then crashes.
pastebin of crash report: https://pastebin.com/JUxFpNZN

try removing optifine

That looks to be a wild interaction between ponder, apotheosis and performant. I'll see what I can do

Thanks for the report, this was addressed in 0.3.1a
Please re-open if the issue persists. Cheers!~

I just read what you had said, and I will just confirm that optifine does not seem to be the issue