1366 - Incorrect integer value: '' for column `CP_as15`.`whos_online`.`customer_id` at row 1

insert into whos_online (customer_id, full_name, session_id, ip_address, time_entry, time_last_click, last_page_url) values ('', 'Guest', '9cetu8dlge7sfoqk8us6b2soc3', '18.191.139.31', '1738994451', '1738994451', '/index.php?XTCsid=rl82acg8c5l20cikdfeu2s7rt7&cat=c925_Tablet-PC---E-Reader-Zubeh--r.html')

[XT SQL Error]