Minecraft v1.15.2
Forge v31.2.31
Fairy Lights v3.0.5
JEI v6.0.2.12

If I press u to view the use for a light, JEI will instead throw an exception and show a blank gui instead.
Error Log

Thanks for reporting, I'll look into it!

Thanks!

I've fixed the problem in dev now. A new patch will be out within a few days.

3.0.7 is now out