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', '9ae493a18ed63ac9bef0aabade2ed8cc', '52.90.227.42', '1711718821', '1711718821', '/product_info.php/info/p3551_Ist-Faeroeer--2-Reliefkarte.html')

[XT SQL Error]