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', '5ca7f923ad398b63d145ceaf0bd2e318', '216.73.216.169', '1755543577', '1755543577', '/shop/product_info.php?info=p10_.html')

[XT SQL Error]