1366 - Incorrect integer value: '' for column `dogsdream`.`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', '3a74fa593202b926684bca3fd36ea6f9', '216.73.216.9', '1759386347', '1759386347', '/shop/product_info.php/info/p9_BIO---Moehrenkuchen.html')

[XT SQL Error]