Fatal error: Uncaught mysqli_sql_exception: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '' at line 1 in /var/www/html/admin/includes/library_source.php:354 Stack trace: #0 /var/www/html/admin/includes/library_source.php(354): mysqli_query() #1 /var/www/html/admin/includes/tienda/cart/inc/functions.inc.php(238): consulta_bd() #2 /var/www/html/pags/ficha.php(81): tieneDescuento() #3 /var/www/html/index.php(52): include('...') #4 {main} thrown in /var/www/html/admin/includes/library_source.php on line 354