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', '5c8eaa915f6443dd00c5d9d798156ce8', '216.73.216.8', '1758040130', '1758040130', '/index.php/language/de/refID/1/cat/c19_Reliefkarten-Digital.html')

[XT SQL Error]