Fatal error: Uncaught TypeError: mysqli_num_rows(): Argument #1 ($result) must be of type mysqli_result, null given in /var/www/webroot/ROOT/js/cubeportfolio/ajax-lightbox-gallery/project1.php:22 Stack trace: #0 /var/www/webroot/ROOT/js/cubeportfolio/ajax-lightbox-gallery/project1.php(22): mysqli_num_rows(NULL) #1 {main} thrown in /var/www/webroot/ROOT/js/cubeportfolio/ajax-lightbox-gallery/project1.php on line 22