1366 - Incorrect integer value: '' for column `pella-ware`.`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', '9c140d3a05e17d17d0e40472f0a8e0fc', '44.201.99.133', '1711700164', '1711700164', '/shop_content.php?language=de&coID=1')

[XT SQL Error]