1366 - Incorrect integer value: '' for column `mapshopatlogis`.`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', '4428e81e5bd4f67cfd1c925b3c54c442', '216.73.216.0', '1758078499', '1758078499', '/index.php/cat/c30_Laender.html')

[XT SQL Error]