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', '4b6jsiqha4noqdj8j9rvjgs4l3', '13.59.188.23', '1738997603', '1738997603', '/index.php?XTCsid=rkdf8qfiujodbcb5st13ohfmn6&cat=c751_Industrie-Akkus.html')

[XT SQL Error]