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', 'pnkgtnot5b21p87e9q1ushdc90', '216.73.216.86', '1767696882', '1767696882', '/product_info.php?XTCsid=38f09672db884903e3803adf9d076819&info=p21_Paper-tablecloth-10-meters.html')

[XT SQL Error]