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', '4ahefgiipn2jj613s5v9b60vq5', '216.73.216.112', '1761582259', '1761582259', '/product_info.php?info=p101_Mehrzweck-Fasspumpe.html')

[XT SQL Error]