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', 'lmvp5ugievrblqv2u8786pen46', '3.12.151.104', '1747105061', '1747105061', '/product_info.php?info=p646_800055-Deckel-fuer-Futterdaempfer-100-L.html')

[XT SQL Error]