Studio Pro 11.12.0 - Page Editor crashes with React error #426

Hello Mendix ,

I encountered an issue in Mendix Studio Pro 11.12.0 where the Page Editor crashes while opening a page.

Error message:

Mendix.Modeler.WebFoundation.Model.WebComponentException:
Minified React error #426
Occurred in component: page-editor/editor

Stack trace:

Error: Minified React error #426
Occurred in component: page-editor/editor
at react-dom.js ...

This appears to be a React UI error inside Studio Pro rather than a runtime application error. The editor fails to render the page, preventing further editing.

Studio Pro Version:

• 11.12.0

Expected behavior:

The page should open normally in the Page Editor without crashing.

Actual behavior:

The Page Editor throws a React error (#426) and the page cannot be opened.

Please let me know if you need the project, log files, or steps to reproduce the issue.

Thank you.