When visiting the main page of the shadcn/ui website, changing the theme to either scaled or mono works initially. However, if you navigate to the /theme page afterward to copy the theme configuration, the site throws a client-side exception and shows an error message:

Application error: a client-side exception has occurred while loading ui.shadcn.com (see the browser console for more information).

This crash consistently occurs after switching to a non-default theme and going to /theme.

Affected component/components

Likely related to the theme switcher and theme configuration system. Possibly components involved in theme loading or persistence.

How to reproduce

Visit https://ui.shadcn.com/

Click on the "Themes" dropdown on the homepage and select either scaled or mono

Navigate to /theme either directly or via the UI

Click on Copy Code

Observe the crash and error message

Codesandbox/StackBlitz link

Not applicable – bug occurs on the official website

Logs

Application error: a client-side exception has occurred while loading ui.shadcn.com

System Info

OS: Windows 11

Browser: Microsoft Edge (Chromium-based)

Also reproduced on Chrome latest

Device: Desktop

Before submitting

• I've made research efforts and searched the documentation
• I've searched for existing issues