I was adding a simple crafttweaked recipe and got this crash
https://pastebin.com/jEc8fTD4

I had set every input slot into the oredict slot, added the four sticks in a 2x2 and then went to add the output item where it crashed on clicking it in.

Version 1.0.1

Ah, it looks like empty slots will crash when the oredict type is set. Should be an easy fix.

Fixed in 32573a2