What happened:

Client crashes when viewing the mod Chisels and Bits in EMI. (JEI is installed.)

Versions:

MC: 1.20.1
Forge: 47.1.3
Chisels and Bits: 1.4.141
JEI: 15.2.0.27
EMI: 1.0.19

Crash Report:

https://gist.githubusercontent.com/Gbergz/1fd23d632daf8a3d536674be3d231234/raw/8695e3ff497c20d29576ec0640548054701a2555/gistfile1.txt

Crash is reported on Chisels and Bits issue tracker too incase its caused by them:
https://github.com/ChiselsAndBits/Chisels-and-Bits/issues/1143

I believe this is an issue caused by Chisels and Bits not having a fallback in their custom item renderer.

It is technically annotated that way, but:

That is the world, I'm talking about the model method which explicitly has a nullable world.

There is no way to do this alternatively.......
The model needs access to the registry to generate all the variants on demand.....

I am not sure why EMI is trying to access block and item models outside of the world being setup?

The only time it'd be accessed is to render it during gameplay after the world is loaded.

That can be resolved then

It seems like EmiAgnosForge hard passes null for the Level, instead of whatever level the MinecraftClient instance may or may not have inside it. This is a potential origin of the conflict:

I was able to resolve this on my end, but I will maintain chisel and bits needs to be safer, the world parameter is annotated by mojang as nullable.