1366 - Incorrect integer value: '' for column `mapshopatlogis`.`whos_online`.`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', 'f4eb9a8e28d075d50dc4a11535b5e969', '216.73.216.121', '1771102369', '1771102369', '/')

[XT SQL Error]