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', 'if8kt28gvqf5inp5d1tt99euk0', '216.73.216.47', '1758162380', '1758162380', '/product_info.php?info=p14_800147-Ofenrohrset---fuer-alle-Daempfergroe-en.html')

[XT SQL Error]