1366 - Incorrect integer value: '' for column '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', '3b1b01d0329935da5b4b110b02eb1b29', '216.73.216.186', '1770811622', '1770811622', '/shop/product_info.php?info=p159_Anders-Kochen-von-Soeren-Anders.html')

[XT SQL Error]