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', '43ea2f8638614debed31588cf755e1dd', '3.236.112.101', '1728499787', '1728499787', '/product_info.php/info/p439_Reliefkarten-Konfigurator.html?refID=1')

[XT SQL Error]