WP 6.1.1: clicking the dashboard "Generate" button creates an empty page

[benlk]

Running with WP_DEBUG, the following information is output to the log:

[13-Apr-2023 20:06:35 UTC] PHP Warning:  Attempt to read property "ID" on null in /var/www/html/wp-content/plugins/kitchen-sink/classes/class-page-generation.php on line 106
[13-Apr-2023 20:06:35 UTC] PHP Stack trace:
[13-Apr-2023 20:06:35 UTC] PHP   1. {main}() /var/www/html/wp-admin/index.php:0
[13-Apr-2023 20:06:35 UTC] PHP   2. require_once() /var/www/html/wp-admin/index.php:10
[13-Apr-2023 20:06:35 UTC] PHP   3. require_once() /var/www/html/wp-admin/admin.php:34
[13-Apr-2023 20:06:35 UTC] PHP   4. require_once() /var/www/html/wp-load.php:50
[13-Apr-2023 20:06:35 UTC] PHP   5. require_once() /var/www/html/wp-config.php:112
[13-Apr-2023 20:06:35 UTC] PHP   6. do_action($hook_name = 'init') /var/www/html/wp-settings.php:617
[13-Apr-2023 20:06:35 UTC] PHP   7. WP_Hook->do_action($args = [0 => '']) /var/www/html/wp-includes/plugin.php:517
[13-Apr-2023 20:06:35 UTC] PHP   8. WP_Hook->apply_filters($value = '', $args = [0 => '']) /var/www/html/wp-includes/class-wp-hook.php:332
[13-Apr-2023 20:06:35 UTC] PHP   9. Page_Generation->generate_page('') /var/www/html/wp-includes/class-wp-hook.php:308