Crash log:
https://pastebin.com/41wK8wHj
produced by just opening my inventory.
I just recently updated to Forge 28.0.49 on 1.14.4 if that's any help.

That was fast!

Thanks for the report. I'll have a lookt at it soon!

Should I report it to the JEI developer?

Yep. Seems like an issue with jei.

Alright. Reporting it now!

One question. How can you reproduce it? Or did it just crash randomly?

Seems like this method was made private and jei tries to call it:
Class: net.minecraft.client.renderer.ItemRenderer

   private void renderModel(IBakedModel model, ItemStack stack) {
      this.renderModel(model, -1, stack);
   }

I can reproduce by just opening my inventory. The two mods were working perfectly before I updated Forge. Maybe that's the issue?

Well thats weird. Because I have no issues doing all this stuff with these versions.

Seems still be an issue on jei's side so I cannot do much about it :/
mezz/JustEnoughItems#1680

Well, I'll just wait for mezz to fix it then.

Fixed in jei, so I close this issue here