[joy-ui][docs] Theme viewer throwing a client-side exception error

[sambowenhughes]

Steps to reproduce

Link to live example: (required)
https://mui.com/joy-ui/customization/theme-builder/

Steps:

1. Navigate to the MUI Theme Builder
2. Double-click on the Dark theme button
3. See client Exception

Area.mp4

Current behavior

Client-Side Exception Error.

Console Error:

main-d9c74b1af963c3f2.js:1 TypeError: Cannot read properties of undefined (reading 'palette')
    at theme-builder-b2a624…7b468449.js:1:90006
    at Object.l5 [as useMemo] (framework-b6917e2005159cfe.js:17:101962)
    at t.useMemo (framework-b6917e2005159cfe.js:33:5984)
    at modules/components/JoyThemeBuilder.tsx (theme-builder-b2a624…7b468449.js:1:89942)
    at lD (framework-b6917e2005159cfe.js:17:97589)
    at oU (framework-b6917e2005159cfe.js:17:110090)
    at i (framework-b6917e2005159cfe.js:17:163565)
    at ia (framework-b6917e2005159cfe.js:17:147020)
    at framework-b6917e2005159cfe.js:17:146799
    at ir (framework-b6917e2005159cfe.js:17:146806)

Expected behavior

I'd expect the button to accept a double click without throwing the exception.

Context

I was experimenting with the Theme Builder when I came across this issue.

Your environment

• Sidekick Browser Version 122.5
• Google Chrome Version 124.0

Search keywords: Theme Viewer Client-Side Exception Error