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', 'eb402c8102837d504a61f41d680d2632', '216.73.216.116', '1752385973', '1752385973', '/index.php/language/en/refID/2')

[XT SQL Error]