Describe the bug

When I try to start a server with Modular Routers added, it crashes late in the process.

How to reproduce the bug

1. Make a server with Modular Routers (+dependencies) and NeoForge
2. Start the server
3. Wait
4. See error

Expected behavior

For the server to start

Additional details

The Minecraft version is 1.21, but that is not available in the dropdown below. I have edited the version number after selecting 1.20 😄

Theurgy also crashes on startup on the same instance, mentioning it in case there's a correlation.
klikli-dev/theurgy#186

Which Minecraft version are you using?

1.21

Crash log

https://gist.github.com/NielsPilgaard/28f2fabee7f8c7c23c9d36faa8646e65

FYI: The first part of the crashlog comes from theurgy (fixed now!) and is unrelated to the Modular Routers creative tab issue.
MR stuff starts at https://gist.github.com/NielsPilgaard/28f2fabee7f8c7c23c9d36faa8646e65#file-crash-txt-L140

Yeah, I see what's going on here, will get this sorted.

Should be fixed in 13.0.1 release

Thank you kindly 😊