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', '4apnmjvt5soh533a536cj58ve5', '3.142.114.23', '1738997934', '1738997934', '/index.php?XTCsid=nmu1l7bj1113ksvu525rsptc72&cat=c920_Roboter---Staubsauger-Zubeh--r.html')

[XT SQL Error]