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', 'aogq6bm36bvt2r83op2em34cu7', '216.73.217.152', '1791136402', '1791136402', '/product_info.php?XTCsid=4299a8bbf7f56cb5a06703b866244eb3&info=p10_3-packs-Blow-outs.html')

[XT SQL Error]