Как исправить SQL ошибку?

[Jylik01]

Fatal error: Uncaught exception 'Exception' with message 'Error: Subquery returns more than 1 row
Error No: 1242
SELECT DISTINCT *, pd.name AS name, p.image, m.name AS manufacturer, (SELECT price FROM oc_product_discount pd2 WHERE pd2.product_id = p.product_id AND pd2.customer_group_id = '8' AND pd2.quantity = '1' AND ((pd2.date_start = '0000-00-00' OR pd2.date_start < NOW()) AND (pd2.date_end = '0000-00-00' OR pd2.date_end > NOW())) ORDER BY pd2.priority ASC, pd2.price ASC LIMIT 1) AS discount, (SELECT price FROM oc_product_special ps WHERE ps.product_id = p.product_id AND ps.customer_group_id = '8' AND ((ps.date_start = '0000-00-00' OR ps.date_start < NOW()) AND (ps.date_end = '0000-00-00' OR ps.date_end > NOW())) ORDER BY ps.priority ASC, ps.price ASC LIMIT 1) AS special, (SELECT points FROM oc_product_reward pr WHERE pr.product_id = p.product_id AND pr.customer_group_id = '8') AS reward, (SELECT ss.name FROM oc_stock_status ss WHERE ss.stock_status_id = p.stock_status_id AND ss.language_id = '2') AS stock_st in /var/www/u0073989/sportvitamin.ru/system/library/db/mysqli.php on line 40

 

 

если проблема в SELECT points FROM oc_product_reward pr WHERE pr.product_id = p.product_id AND pr.customer_group_id = '8'), либо тут (SELECT ss.name FROM oc_stock_status ss WHERE ss.stock_status_id = p.stock_status_id AND ss.language_id = '2'), где именно вписать LIMIT 1, извините за тупой вопрос