Fatal error: Uncaught Exception: Error: Subquery returns more than 1 row<br />Error No: 1242<br />SELECT GROUP_CONCAT(DISTINCT product_id) as product_id FROM oc_product_to_category WHERE category_id = (SELECT category_id FROM oc_product_to_category WHERE main_category = 1 AND product_id = '45505') in /var/www/onliners_ru_usr/data/www/onliners.ru/system/library/db/mysqli.php:45 Stack trace: #0 /var/www/onliners_ru_usr/data/www/onliners.ru/system/library/db.php(21): DB\MySQLi->query('SELECT GROUP_CO...', Array) #1 /var/www/onliners_ru_usr/data/www/onliners.ru/catalog/model/catalog/filter.php(23): DB->query('SELECT GROUP_CO...') #2 /var/www/onliners_ru_usr/data/www/onliners.ru/system/storage/modification/system/engine/loader.php(193): ModelCatalogFilter->getFilterProducts(45505) #3 /var/www/onliners_ru_usr/data/www/onliners.ru/system/engine/proxy.php(30): Loader->{closure}(Array, Array) #4 /var/www/onliners_ru_usr/data/www/onliners.ru/system/storage/modification/catalog/controller/product/product.php(1083): Proxy->__call('ge in /var/www/onliners_ru_usr/data/www/onliners.ru/system/library/db/mysqli.php on line 45