Error!

MySQL Error: Incorrect integer value: '' for column 'ref_id' at row 1
SQL Statement: INSERT INTO user_tracking_current_11 (object_type,object_id,req_url,http_referer,accessed_on,user_id,ref_type,ref_id,user_ip,user_agent) VALUES ('content','330310','/contents/view_blog/2020-01-27/paper-industry-sees-growing-audience/','','2022-01-23 03:48:54',-1,'','','54.174.225.82','CCBot/2.0 (https://commoncrawl.org/faq/)')