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', '47cf401b08914860e8dacdad96f2c07a', '216.73.216.108', '1763280785', '1763280785', '/index.php/language/de/cat/c35_Countries.html/page/1')

[XT SQL Error]