MySQL ERROR!!!

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 'WHERE `i`.`onoff` = 1 ASC LIMIT 0, 1' at line 14
SELECT `p`.`product_id`, `p`.`rewrite` , `i`.`image_id` FROM `autoasia_catalog_images` `i` INNER JOIN `autoasia_catalog_products` `p` ON `i`.`product` = `p`.`product_id` WHERE `product` = '5025' ORDER BY `main` DESC WHERE `i`.`onoff` = 1 ASC LIMIT 0, 1