Fatal error: Uncaught ValueError: mysqli_query(): Argument #2 ($query) cannot be empty in /var/www/html/search/includes/retrieve_data.php:327 Stack trace: #0 /var/www/html/search/includes/retrieve_data.php(327): mysqli_query(Object(mysqli), '') #1 /var/www/html/search/index.php(15): include('/var/www/html/s...') #2 {main} thrown in /var/www/html/search/includes/retrieve_data.php on line 327