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', 'acf740c4e4b6d47eb786a1c5676ef6c8', '216.73.216.198', '1752880110', '1752880110', '/shop_content.php/coID/7/content/Kontakt')

[XT SQL Error]