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', 'srd6ij2kiacnmf4bble4u0fcf2', '216.73.216.46', '1767737779', '1767737779', '/product_info.php?info=p121_804589-Maiskolbenentkoerner--Maiskolben-Entkorngeraet.html')

[XT SQL Error]