Error when opening a backend page

Hello, when I open the event categories page of the events-manager plugin in the backend, my WordPress installation reports the following error:

WordPress-Version 6.6.2
Aktives Theme: Twenty Fifteen (Version 3.8)
Aktuelles Plugin: PublishPress Permissions (Version 4.0.30)
PHP-Version 8.2.3



Fehler-Details
==============
Ein Fehler vom Typ E_ERROR wurde in der Zeile 135 der Datei /var/www/html/wp-content/plugins/press-permit-core/classes/PublishPress/PermissionsHooks.php verursacht. Fehlermeldung: Uncaught Error: Call to a member function get_col() on null in /var/www/html/wp-content/plugins/press-permit-core/classes/PublishPress/PermissionsHooks.php:135
Stack trace:
#0 /var/www/html/wp-includes/class-wp-hook.php(324): PublishPress\PermissionsHooks->actCreatedEventCategory()
#1 /var/www/html/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters()
#2 /var/www/html/wp-includes/plugin.php(517): WP_Hook->do_action()
#3 /var/www/html/wp-settings.php(700): do_action()
#4 /var/www/html/wp-config.php(141): require_once('...')
#5 /var/www/html/wp-load.php(50): require_once('...')
#6 /var/www/html/wp-admin/admin.php(34): require_once('...')
#7 /var/www/html/wp-admin/edit-tags.php(10): require_once('...')
#8 {main}
thrown

Can anyone help me with this? Thank you!