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', '1883957a084314f33eb9cfa065c38137', '216.73.216.220', '1769751611', '1769751611', '/shop_content.php/coID/23/content/Bestellablauf')

[XT SQL Error]