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', '6a8ea71e892032925cafabf74a7384ff', '216.73.216.121', '1751839958', '1751839958', '/index.php/language/en/cat/c42_Vektorkarten.html')

[XT SQL Error]