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', 'c5f668d84046c259d1db21b9ba162b51', '216.73.216.44', '1768642261', '1768642261', '/index.php/language/en/refID/1')

[XT SQL Error]