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', 'a0nccli81kqveptj88lbf2bcd2', '216.73.216.162', '1762503961', '1762503961', '/product_info.php?info=p11_804350-Kartoffeldaempfer--Futterdaempfer-63-Liter--teilverzinkt.html')

[XT SQL Error]