[wp-trac] [WordPress Trac] #58183: PHP notice when accessing Customizer with a classic theme without widgets

[WordPress Trac]

#58183: PHP notice when accessing Customizer with a classic theme without widgets
--------------------------+-----------------------------
 Reporter:  kraftner      |      Owner:  (none)
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  Awaiting Review
Component:  Customize     |    Version:
 Severity:  normal        |   Keywords:
  Focuses:                |
--------------------------+-----------------------------
 If you open the Customizer with a classic theme that doesn't have any
 widget areas registered the following PHP warning is emitted:


 {{{
 PHP Warning:  Attempt to read property "title" on null in /var/www/html
 /wp-includes/class-wp-customize-widgets.php on line 905
 PHP Stack trace:
 PHP   1. {main}() /var/www/html/wp-admin/customize.php:0
 PHP   2. do_action($hook_name = 'customize_controls_print_footer_scripts')
 /var/www/html/wp-admin/customize.php:302
 PHP   3. WP_Hook->do_action($args = [0 => '']) /var/www/html/wp-
 includes/plugin.php:517
 PHP   4. WP_Hook->apply_filters($value = '', $args = [0 => ''])
 /var/www/html/wp-includes/class-wp-hook.php:332
 PHP   5. WP_Customize_Widgets->output_widget_control_templates('')
 /var/www/html/wp-includes/class-wp-hook.php:308
 }}}


 This seems to be similar to #54905.

 It seems that this is a similar issue, also mentioned by #56142, but not
 included in the fix deployed with #54419 since @westonruter wasn't able to
 reproduce it: https://core.trac.wordpress.org/ticket/54905#comment:38

 This tickets adds the steps to reproduce it in the hope to then be able to
 find a fix.

 == Steps to reproduce

 1. Create/Use a classic theme that does **not** have Widgets.
 2. Open the customizer
 3. Find the PHP warning in the logs.

 == Versions

 WordPress 6.2
 PHP 8.2

 (But also appears with other, older combinations, e.g. WP 5.9 and PHP 8.0)

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Ticket URL: <https://core.trac.wordpress.org/ticket/58183>
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