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', 'de834bff0fb19e873723b8e434fcb640', '216.73.216.172', '1794148866', '1794148866', '/shop/product_info.php?info=p144_.html')

[XT SQL Error]