Error: Incorrect DATE value: '0000-00-00'<br />Error No: 1525<br />SELECT price FROM product_discount WHERE product_id = '521' AND customer_group_id = '8' AND quantity = '1' AND ((date_start = '0000-00-00' OR date_start < NOW()) AND (date_end = '0000-00-00' OR date_end > NOW())) ORDER BY priority ASC, price ASC LIMIT 1