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', 'etn5s6m0ufol3alifoi23ai066', '216.73.216.112', '1761580201', '1761580201', '/product_info.php?info=p462_50-Spezialkartuschen-Kal--9x17.html')

[XT SQL Error]