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', '9a2169f13db5340010841d0bf2a49b98', '216.73.216.20', '1771725251', '1771725251', '/product_info.php?info=p3208_Ghana-Reliefkarte.html')

[XT SQL Error]