1366 - Incorrect integer value: '' for column `hbl_shop`.`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', 'nm1vujjejs5oev525pj2rko3q6', '216.73.216.89', '1767055391', '1767055391', '/product_info.php?info=p605_804121-Sternfraese--Rollhacke--Kultivator.html')

[XT SQL Error]