SELECT id_art_p FROM articulos_p WHERE id_prov= AND ref_fabricante=''

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 'AND ref_fabricante=''' 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 id_art_p...') #1 C:\xampp\htdocs\intranet_api\clases\articulos_generales.php(81): database->query() #2 C:\xampp\htdocs\intranet_api\articulos\alta_articulo_general.php(20): articulos_generales->actualizar_bd(NULL, '') #3 {main} thrown in C:\xampp\htdocs\intranet_api\database.php on line 75