Решил так:
Заменил это в
admin\model\blog\category.php
$this->db->query("UPDATE " . DB_PREFIX . "blog_category SET parent_id = '" . (int)$data['parent_id'] . "', `top` = '" . (isset($data['top']) ? (int)$data['top'] : 0) . "', `column` = '" . (int)$data['column'] . "', sort_order = '" . (int)$data['sort_order'] . "', status = '" . (int)$data['status'] . "', noindex = '" . (int)$data['noindex'] . "', date_modified = NOW() WHERE blog_category_id = '" . (int)$blog_category_id . "'");
на это
$this->db->query("UPDATE " . DB_PREFIX . "blog_category SET parent_id = '" . (int)$data['parent_id'] . "', `top` = '" . (isset($data['top']) ? (int)$data['top'] : 0) . "', sort_order = '" . (int)$data['sort_order'] . "', status = '" . (int)$data['status'] . "', noindex = '" . (int)$data['noindex'] . "', date_modified = NOW() WHERE blog_category_id = '" . (int)$blog_category_id . "'");