1366 - Incorrect integer value: '' for column `evanzo_baumi`.`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', '26b11a713e2ee6fa058679881e7c5676', '216.73.216.118', '1758906163', '1758906163', '/index.php?cat=c1_Natur--Wasserabziehsteine.html')

[XT SQL Error]