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', 'qei9on9mpon5rmchvnjqkauep4', '18.118.252.210', '1738996158', '1738996158', '/index.php?XTCsid=e08p0achgq0tssilr9o0o9bta6&cat=c710_LED-Leuchtmittel.html')

[XT SQL Error]