Steps to Reproduce the Crash

1. Install Kaleidio's Battle Pack 5.4.0
2. Cycle loading and closing over and over until this specific crash occurs (there is another start up crash but ignore that one as it is not related.)

Mod Pack URL (Optional)

https://legacy.curseforge.com/minecraft/modpacks/kaleidios-battle-pack

Mod Pack Version (Optional)

5.4.0

Extra Notes (Optional)

The crash is ridiculously random. It will crash most often if the window has no focus whilst the game is loading up. Quickly click off the window the moment it appears to try and force it.

The crash blames a vanilla foreach while stitch textures looking at this texture provider your code has
https://github.com/mezz/JustEnoughItems/blob/1.16/src/main/java/mezz/jei/gui/textures/JeiSpriteUploader.java

It seems, at least to my deduction, that your code for whatever reason does not guarantee through thread racing that the textures will be provided in time to the vanilla stitching system. However this is usually fine (especially without this modpack) unless the atlas is unusually heavy in count of items such as in my modpack, or some mods may not have finished stitching their own items yet or something along those lines.

Crash Report

https://gist.github.com/Kaleidio/2450d7cc2a0c4d899f74088e1f1c6ad2

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