[wp-trac] [WordPress Trac] #57446: Theme switch, retrieve_widgets(), and malformed/missing sidebars_widgets leading to fatal error

[WordPress Trac]

#57446: Theme switch, retrieve_widgets(), and malformed/missing sidebars_widgets
leading to fatal error
--------------------------+------------------------------
 Reporter:  verygoode     |       Owner:  (none)
     Type:  defect (bug)  |      Status:  new
 Priority:  normal        |   Milestone:  Awaiting Review
Component:  Widgets       |     Version:  6.1.1
 Severity:  normal        |  Resolution:
 Keywords:                |     Focuses:
--------------------------+------------------------------

Comment (by verygoode):

 To prevent the issue on a site that hasn't switched themes yet, it's
 possible to repair theme_mods by adding a sidebars_widgets array.

 E.g.
 `a:3:{s:18:"nav_menu_locations";a:3:{s:4:"avia";i:73;s:5:"avia2";i:0;s:5:"avia3";i:0;}s:18:"custom_css_post_id";i:2960;s:16:"sidebars_widgets";a:0:{}}`

 However, for a site already affected, it doesn't make a difference.

 Seems `retrieve_widgets()`'s `unset( $sidebars_widgets['array_version']
 );` needs safeguards like what was added to `wp_get_sidebars_widgets()`
 via https://core.trac.wordpress.org/changeset/14320

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Ticket URL: <https://core.trac.wordpress.org/ticket/57446#comment:4>
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