Fatal error: Uncaught exception 'Exception' with message '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 '' at line 1<br />Error No: 1064<br />SELECT GROUP_CONCAT(filter_id) as filter FROM oc_filter WHERE filter_group_id = ' in /var/www/istore_su_usr/data/www/istore.su/system/storage/modification/system/library/db/mysqli.php:52 Stack trace: #0 /var/www/istore_su_usr/data/www/istore.su/system/library/db.php(21): DB\MySQLi->query('SELECT GROUP_CO...', Array) #1 /var/www/istore_su_usr/data/www/istore.su/catalog/model/catalog/filter.php(66): DB->query('SELECT GROUP_CO...') #2 [internal function]: ModelCatalogFilter->getFilterRelatedProducts(1936) #3 /var/www/istore_su_usr/data/www/istore.su/system/storage/modification/system/engine/loader.php(186): call_user_func_array(Array, Array) #4 [internal function]: Loader->{closure}(Array, Array) #5 /var/www/istore_su_usr/data/www/istore.su/system/engine/proxy.php(30): call_user_func_array(Ob in /var/www/istore_su_usr/data/www/istore.su/system/storage/modification/system/library/db/mysqli.php on line 52