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', 'q374ce0n6fmb4h41an79b5va56', '216.73.216.82', '1752530599', '1752530599', '/product_info.php?info=p19_10-Paper-Plates.html&XTCsid=38f09672db884903e3803adf9d076819')

[XT SQL Error]