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', 'pneuqp0a7bo782gg755dn2be55', '216.73.216.130', '1761207371', '1761207371', '/product_info.php?XTCsid=38f09672db884903e3803adf9d076819&info=p11_Fan-for-decorations.html')

[XT SQL Error]