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', '286eddfcde2439747cb3f5a45a5c5ae1', '18.191.88.249', '1714033916', '1714033916', '/shop_content.php?language=de&coID=4')

[XT SQL Error]