1366 - Incorrect integer value: '' for column `hbl_shop`.`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', 'k6p077i91i1b5vbaqg9b7fn8c3', '216.73.216.47', '1758169777', '1758169777', '/index.php?cat=c64_Ersatzteile-E-Daempfer.html')

[XT SQL Error]