Hello,
Version: NotEnoughItems-1.12-2.4.0.231-universal
Forge: 1.12.1-14.22.1.2481

Issue: Crash to desktop on launch.

Debug:
java.lang.NullPointerException: Initializing game
at net.minecraft.client.renderer.entity.RenderItemFrame.(RenderItemFrame.java:35)
at net.minecraft.client.renderer.entity.RenderManager.(RenderManager.java:206)
at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:517)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:377)
at net.minecraft.client.main.Main.main(SourceFile:123)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at net.minecraft.launchwrapper.Launch.launch(Launch.java:137)
at net.minecraft.launchwrapper.Launch.main(Launch.java:28)

1, Please don't provide a smug report.
2, NEI is not in that stacktrace.

Please disregard. Turned out to be an issue with a incorrectly configured ASM Mixin.