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', '6t19hv7ts6hq9oa9o4i49u7v37', '216.73.217.95', '1792936289', '1792936289', '/index.php?XTCsid=d163dd0fc0b54bf3066f85422c77e00a&cat=c13_Accessoires.html')

[XT SQL Error]