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', 'c34bf2da01f648032ae03c1fe357f6bd', '3.15.190.144', '1715186679', '1715186679', '/shop_content.php?language=de&coID=8')

[XT SQL Error]