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', '2u2fbvenkekl5tu5o3dsikpc45', '216.73.216.7', '1758225230', '1758225230', '/product_info.php?XTCsid=4299a8bbf7f56cb5a06703b866244eb3&info=p10_3-packs-Blow-outs.html')

[XT SQL Error]