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', 'bpcakj2kb2dgojstpb8v5418r3', '216.73.216.47', '1758004353', '1758004353', '/product_info.php?info=p646_800055-Deckel-fuer-100-Liter-Futterdaempfer.html')

[XT SQL Error]