The Editor shows TypeError: Cannot read properties of null (reading 'toString') when Gutenberg is active

[RafaelFunchal]

Quick summary

Slack ping: p1734361511221669-slack-C03TY6J1A

When Gutenberg is active on the site, it is not possible to edit and create posts and pages.

The Editor shows the modal:

The editor has encountered an unexpected error.

Copying the error reveals these lines:

TypeError: Cannot read properties of null (reading 'toString')
    at https://DOMAIN/wp-content/plugins/gutenberg/build/components/index.min.js?ver=1d11f77954d9898b0db4:94:6274
    at t (https://DOMAIN/wp-content/plugins/gutenberg/build/components/index.min.js?ver=1d11f77954d9898b0db4:1:2840)
    at n (https://DOMAIN/wp-content/plugins/gutenberg/build/components/index.min.js?ver=1d11f77954d9898b0db4:94:9945)
    at t.get (https://DOMAIN/wp-content/plugins/gutenberg/build/components/index.min.js?ver=1d11f77954d9898b0db4:94:10106)
    at t.render (https://DOMAIN/wp-content/plugins/gutenberg/build/components/index.min.js?ver=1d11f77954d9898b0db4:94:18759)
    at kr (https://DOMAIN/wp-content/plugins/gutenberg/build/vendors/react-dom.min.js?ver=18:1:59358)
    at br (https://DOMAIN/wp-content/plugins/gutenberg/build/vendors/react-dom.min.js?ver=18:1:59157)
    at js (https://DOMAIN/wp-content/plugins/gutenberg/build/vendors/react-dom.min.js?ver=18:1:121074)
    at Sl (https://DOMAIN/wp-content/plugins/gutenberg/build/vendors/react-dom.min.js?ver=18:1:88331)
    at kl (https://DOMAIN/wp-content/plugins/gutenberg/build/vendors/react-dom.min.js?ver=18:1:88259)

The domain has been removed for privacy concerns.

We already tried deactivating all plugins and switching to a Core theme.

Steps to reproduce

1. Go to Posts
2. Click on Add New Post or on any post to edit.
3. The error is displayed.

What you expected to happen

To load the editor to create and edit posts.

What actually happened

The editor shows an error:

The editor has encountered an unexpected error.

Impact

One

Available workarounds?

Yes, easy to implement

If the above answer is "Yes...", outline the workaround.

For now, the workaround is to deactivate the Gutenberg plugin.

Platform (Simple and/or Atomic)

No response

Logs or notes

No response