Fatal error: Uncaught TypeError: Argument 1 passed to TablePress_Frontend_Controller::posts_search_filter() must be of the type string, null given, called in /home/customer/www/univertelai.it/public_html/wp-includes/class-wp-hook.php on line 326 and defined in /home/customer/www/univertelai.it/public_html/wp-content/plugins/tablepress/controllers/controller-frontend.php:904 Stack trace: #0 /home/customer/www/univertelai.it/public_html/wp-includes/class-wp-hook.php(326): TablePress_Frontend_Controller->posts_search_filter(NULL) #1 /home/customer/www/univertelai.it/public_html/wp-includes/plugin.php(256): WP_Hook->apply_filters(NULL, Array) #2 /home/customer/www/univertelai.it/public_html/wp-includes/class-wp-query.php(2239): apply_filters_ref_array('posts_search', Array) #3 /home/customer/www/univertelai.it/public_html/wp-includes/class-wp-query.php(3824): WP_Query->get_posts() #4 /home/customer/www/univertelai.it/public_html/wp-includes/class-wp.php(696): WP_Query->query(Array) #5 /home/customer/www/univertelai.it/public_ in /home/customer/www/univertelai.it/public_html/wp-content/plugins/tablepress/controllers/controller-frontend.php on line 904