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', '22usb3ji8j560h0feqdujhlsr1', '216.73.216.220', '1765221509', '1765221509', '/product_info.php?info=p462_299644-Spezialkartuschen-Kal--9x17--50-Stueck.html')

[XT SQL Error]