PHP Warning: Undefined array key “use_ssl”

After upgrade to WP 6.1 , we start to see this warning in logs:

[04-Nov-2022 06:22:46 UTC] PHP Warning:  Undefined array key "use_ssl" in /var/www/html/wp-content/plugins/landing-pages-and-domain-aliases/wordpress-landing-pages.php on line 94
[04-Nov-2022 06:22:46 UTC] PHP Stack trace:
[04-Nov-2022 06:22:46 UTC] PHP   1. {main}() /var/www/html/wp-admin/admin-ajax.php:0
[04-Nov-2022 06:22:46 UTC] PHP   2. require_once() /var/www/html/wp-admin/admin-ajax.php:22
[04-Nov-2022 06:22:46 UTC] PHP   3. require_once() /var/www/html/wp-load.php:50
[04-Nov-2022 06:22:46 UTC] PHP   4. require_once() /var/www/html/wp-config.php:103
[04-Nov-2022 06:22:46 UTC] PHP   5. do_action($hook_name = 'init') /var/www/html/wp-settings.php:617
[04-Nov-2022 06:22:46 UTC] PHP   6. WP_Hook->do_action($args = [0 => '']) /var/www/html/wp-includes/plugin.php:517
[04-Nov-2022 06:22:46 UTC] PHP   7. WP_Hook->apply_filters($value = '', $args = [0 => '']) /var/www/html/wp-includes/class-wp-hook.php:332
[04-Nov-2022 06:22:46 UTC] PHP   8. call_user_func_array:{/var/www/html/wp-includes/class-wp-hook.php:308}($callback = [0 => 'wordpress_landing_pages', 1 => 'init'], $args = [0 => '']) /var/www/html/wp-includes/class-wp-hook.php:308
[04-Nov-2022 06:22:46 UTC] PHP   9. wordpress_landing_pages::init('') /var/www/html/wp-includes/class-wp-hook.php:308

Any idea in how to solve this?

Regards,
Jordi