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', 'd2be95ce7d30292d71fbd9458e4f80b6', '216.73.216.108', '1763265007', '1763265007', '/shop_content.php/language/de/coID/4')

[XT SQL Error]