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', '4serkrb591m8dscscg7oaql9k2', '52.14.223.221', '1738994126', '1738994126', '/index.php?XTCsid=8km4iag7d9anolhh9c02p13aq2&cat=c140_Olympus.html')

[XT SQL Error]