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', 'ca32f54a81d5b18a99cdb68f5f63d40f', '216.73.216.9', '1759512188', '1759512188', '/product_info.php?info=p2632_Mauretanien-Reliefkarte.html')

[XT SQL Error]