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', 'c4865ff6b1ad8aaa53c6aa911fdc1741', '216.73.216.3', '1767297251', '1767297251', '/product_info.php?info=p2739_Schweiz-Reliefkarte.html')

[XT SQL Error]