So I'm going to preface this one with the fact that I fully understand that this shouldn't even be possible, but JEI has a redstone processor in its menu with no nbt data, and I accidentally spawned it in a creative world to test something and when I tried to break it got this crash:
crash-2019-07-25_22.59.07-server.txt

I then decided to mess around and try to break it with a piston and got this crash:
crash-2019-07-25_23.00.30-server.txt

I realize that this is probably a glitched item that's unobtainable in survival but JEI still sees as an item so I am able to spawn it in. Just to prevent mistakes and accidental world corruption in the future, it might be nice to have this fixed.

Screenshot of the glitched item because I realize that my description isn't very good:

In the regular JEI inventory there are two of them, the one with the max complexity levels and the one with none at all. The one with none at all is causing the problem