DataViews: Duplicating an uncategorized pattern causes a JavaScript error

[carolinan]

Description

Originally reported on Trac: https://core.trac.wordpress.org/ticket/62367

crash when duplicating "uncategorized" patterns
condition: Fresh install of wordpress 6.7.RC4. Default 2025 theme.
Recreate problem:

Navigate "appearance" -> "editor" -> "patterns" -> "uncategorized"
select one of the three patterns -> hamburger -> "duplicate"
problem occurs
symptom: black screen - stall -- needs browser refresh to restore.
also throws javascript error;
Uncaught TypeError: e.categories is undefined ... patterns.min.js:2:6657

I am able to reproduce this problem on WordPress 6.7-RC4-59375 with any theme that registers patterns without the categories parameter.

I tested this by removing the categories parameter from a pattern in Twenty Twenty-One, which is a classic theme that registers patterns with the PHP function, and in Twenty Twenty-Four, a block theme that registers patterns by using the patterns folder.
With and without Gutenberg trunk active.

react-dom.min.js?ver=18:1 Uncaught TypeError: Cannot read properties of undefined (reading 'includes')
    at duplicate-pattern-modal.js:20:24
    at Array.filter (<anonymous>)
    at L (duplicate-pattern-modal.js:19:6)
    at U (duplicate-pattern-modal.js:48:22)
    at RenderModal (duplicate-pattern.tsx:26:27)
    at gt (react-dom.min.js?ver=18:1:45667)
    at js (react-dom.min.js?ver=18:1:120123)
    at Sl (react-dom.min.js?ver=18:1:88331)
    at kl (react-dom.min.js?ver=18:1:88259)
    at bl (react-dom.min.js?ver=18:1:88122)

The categories parameter is not required for registering a pattern, and this should not cause an error.
https://developer.wordpress.org/block-editor/reference-guides/block-api/block-patterns/#register_block_pattern

Step-by-step reproduction instructions

Navigate "appearance" -> "editor" -> "patterns" -> "uncategorized"
select one of the three patterns -> hamburger -> "duplicate"
problem occurs
symptom: black screen - stall -- needs browser refresh to restore.
also throws javascript error;
Uncaught TypeError: e.categories is undefined ... patterns.min.js:2:6657

Screenshots, screen recording, code snippet

No response

Environment info

WordPress 6.7-RC4-59375

Please confirm that you have searched existing issues in the repo.

• Yes

Please confirm that you have tested with all plugins deactivated except Gutenberg.

• Yes

Please confirm which theme type you used for testing.

• Block
• Classic
• Hybrid (e.g. classic with theme.json)
• Not sure

[carolinan]

Also reproduced on WordPress 6.6.2.

[getdave]

Thanks for reporting.

Confidence check @ndiego for 6.7.1 🙏

[getdave]

Thanks for the quick fix! Let's get this into 6.7.1. Once WP 6.7 is launched today we can simply add the Backport to WP 6.7 Beta/RC label and it should auto-cherry pick.