Fatal error: Uncaught mysqli_sql_exception: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near '' at line 1 in C:\xampp\htdocs\intranet_api\database.php:75 Stack trace: #0 C:\xampp\htdocs\intranet_api\database.php(75): mysqli_query(Object(mysqli), 'SELECT anio FRO...') #1 C:\xampp\htdocs\intranet_api\clases\ventas.php(548): database->query() #2 C:\xampp\htdocs\intranet_api\ventas\listado_ventas_347_dni.php(15): ventas->crear_json_ventas_347_x_cif(NULL) #3 {main} thrown in C:\xampp\htdocs\intranet_api\database.php on line 75