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', 'k4n7um8m65l6t17e8r6353ki77', '18.117.162.116', '1738997703', '1738997703', '/index.php?XTCsid=c8tsstf8ajiodlgrn3rqsr62b1&cat=c468_Handy-Zubeh--r.html')

[XT SQL Error]