I posted a public order for myself and although I don’t have the recipe, I’m not getting any lua errors or other problems with the craft showing up.
So I would suggest following the steps to do a UI reset, and if that doesn’t work, /console cvar_default
https://us.battle.net/support/en/article/7549
Edit: I don’t think a ui reset is fixing this one. I encountered this on my priest with the cool sunset bracers and did some digging into the profession code. It looks like a reagent slot index that doesn’t exist is being called causing the allocations local to be left nil. I believe it may have to do with the quality of materials, though will have to do some testing on the ptr to try and pinpoint the root cause, assuming the issue also happens on the ptr.