1366 - Incorrect integer value: '' for column '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', '79adfb17e495a9a712e7bf30763df21b', '3.144.7.118', '1722051571', '1722051571', '/product_info.php/info/p14_Akazienhonig.html')

[XT SQL Error]