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', 'phdanld40is58f5g2avn17a033', '216.73.216.76', '1789110477', '1789110477', '/product_info.php?XTCsid=e65207aee44f142683bacdd3544c84a8&info=p5_Large-Garland-33-feet.html')

[XT SQL Error]