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', 'b0c6ee6aeeec91352020ba1cd88bcf00', '216.73.216.53', '1752093713', '1752093713', '/index.php?refID=1')

[XT SQL Error]