PHP Fatal Error: Call to a member function add_page() on null

Hi,

I am seeing the following error in the host error_log. Could I ask you to review and advise?

[01-Jun-2023 03:06:14 UTC] PHP Fatal error: Uncaught Error: Call to a member function add_page() on null in /home/ecocaffecom/public_html/wp-content/plugins/ml-slider/ml-slider.php:441
Stack trace:

0 /home/ecocaffecom/public_html/wp-includes/class-wp-hook.php(308): MetaSliderPlugin->register_admin_pages(”)

1 /home/ecocaffecom/public_html/wp-includes/class-wp-hook.php(332): WP_Hook->apply_filters(NULL, Array)

2 /home/ecocaffecom/public_html/wp-includes/plugin.php(517): WP_Hook->do_action(Array)

3 /home/ecocaffecom/public_html/wp-admin/includes/menu.php(155): do_action(‘admin_menu’, ”)

4 /home/ecocaffecom/public_html/wp-admin/menu.php(420): require_once(‘/home/ecocaffec…’)

5 /home/ecocaffecom/public_html/wp-content/plugins/jetpack/_inc/lib/core-api/wpcom-endpoints/class-wpcom-rest-api-v2-endpoint-admin-menu.php(92): require_once(‘/home/ecocaffec…’)

6 /home/ecocaffecom/public_html/wp-includes/rest-api/class-wp-rest-server.php(1181): WPCOM_REST_API_V2_Endpoint_Admin_Menu->get_item(Object(WP_REST_Request))

7 /home/ecocaffecom/public_html/wp-in in /home/ecocaffecom/public_html/wp-content/plugins/ml-slider/ml-slider.php on line 441