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', '8c3dd5f250f8dcfbfcce7942843f53cf', '216.73.216.3', '1767602888', '1767602888', '/product_info.php?info=p3401_Deutschland-Reliefkarte.html')

[XT SQL Error]