[UNSOLVED] Blank white page on homepage on live shop

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Warning: mysql_query(): Unable to save result set in /var/www/vhosts/thetricklingtap.co.uk/httpdocs/system/database/mysql.php on line 22Notice: 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 product_discount pd2 WHERE pd2.product_id = p.product_id AND pd2.customer_group_id = '1' 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 product_special ps WHERE ps.product_id = p.product_id AND ps.customer_group_id = '1' 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 product_reward pr WHERE pr.product_id = p.product_id AND customer_group_id = '1') AS reward, (SELECT ss.name FROM stock_status ss WHERE ss.stock_status_id = p.stock_status_id AND ss.language_id = '1') AS stock_status, (SELECT wcd.unit FROM weight_class_description wcd WHERE p.weight_class_id = wcd.weight_class_id AND wcd.language_id = '1') AS weight_class, (SELECT lcd.unit FROM length_class_description lcd WHERE p.length_class_id = lcd.length_class_id AND lcd.language_id = '1') AS length_class, (SELECT AVG(rating) AS total FROM review r1 WHERE r1.product_id = p.product_id AND r1.status = '1' GROUP BY r1.product_id) AS rating, (SELECT COUNT(*) AS total FROM review r2 WHERE r2.product_id = p.product_id AND r2.status = '1' GROUP BY r2.product_id) AS reviews, p.sort_order FROM product p LEFT JOIN product_description pd ON (p.product_id = pd.product_id) LEFT JOIN product_to_store p2s ON (p.product_id = p2s.product_id) LEFT JOIN manufacturer m ON (p.manufacturer_id = m.manufacturer_id) WHERE p.product_id = '47' AND pd.language_id = '1' AND p.status = '1' AND p.date_available <= NOW() AND p2s.store_id = '0' in /var/www/vhosts/thetricklingtap.co.uk/httpdocs/system/database/mysql.php on line 50

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$query = $this->db->query("SELECT DISTINCT *, (SELECT GROUP_CONCAT(cd1.name ORDER BY level SEPARATOR ' > ') FROM " . DB_PREFIX . "category_path cp LEFT JOIN " . DB_PREFIX . "category_description cd1 ON (cp.path_id = cd1.category_id AND cp.category_id != cp.path_id) WHERE cp.category_id = c.category_id AND cd1.language_id = '" . (int)$this->config->get('config_language_id') . "' GROUP BY cp.category_id) AS path, (SELECT keyword FROM " . DB_PREFIX . "url_alias WHERE query = 'category_id=" . (int)$category_id . "') AS keyword FROM " . DB_PREFIX . "category c LEFT JOIN " . DB_PREFIX . "category_description cd2 ON (c.category_id = cd2.category_id) WHERE c.category_id = '" . (int)$category_id . "' AND cd2.language_id = '" . (int)$this->config->get('config_language_id') . "'");

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+ $query = $this->db->query("SELECT DISTINCT *, (SELECT GROUP_CONCAT(cd1.name ORDER BY level SEPARATOR ' > ') FROM " . DB_PREFIX . "category_path cp LEFT JOIN " . DB_PREFIX . "category_description cd1 ON (cp.path_id = cd1.category_id AND cp.category_id != cp.path_id) WHERE cp.category_id = c.category_id AND cd1.language_id = '" . (int)$this->config->get('config_language_id') . "' GROUP BY cp.category_id) AS path, (SELECT DISTINCT keyword FROM " . DB_PREFIX . "url_alias WHERE query = 'category_id=" . (int)$category_id . "') AS keyword FROM " . DB_PREFIX . "category c LEFT JOIN " . DB_PREFIX . "category_description cd2 ON (c.category_id = cd2.category_id) WHERE c.category_id = '" . (int)$category_id . "' AND cd2.language_id = '" . (int)$this->config->get('config_language_id') . "'");