The structure tool crashed when running the build preview

[etylsarin]

Describe the bug

When running the preview, I get an error: Cannot read properties of undefined (reading 'color')

To Reproduce

Steps to reproduce the behavior:

1. build sanity
2. run preview

Screenshots

Which versions of Sanity are you using?

@sanity/cli 3.30.0 (up to date)
@sanity/google-maps-input 3.0.2 (up to date)
@sanity/vision 3.30.0 (up to date)
sanity 3.30.0 (up to date)
sanity-plugin-markdown 4.1.1 (up to date)

Which versions of Node.js / npm are you running?

10.2.3
v18.19.0