Sometimes when using a crafting monitor to see the current auto-crafting processes it will crash the server, didn't test on singleplayer. Seems to be easily reproduced by just opening the crafting monitor and hovering around the processes.

• Minecraft: 1.15.2
• Forge: 31.1.49
• Refined Storage: 1.8.3

https://pastebin.com/fLZ4xHxE

Happens when you watch a new autocrafting being created in the crafting monitor while a secondary task updates.

Fixed in dev

Thanks for the update, will be looking forward for the next version!

I'll try to do a release that contains this bugfix tonight.