1366 - Incorrect integer value: '' for column `DBchUcr8hevu`.`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', 'p0tes4ev3kuh4270787u4b21h1', '216.73.216.111', '1771750064', '1771750064', '/shop/index.php/cat/c17_Buchsen.html/XTCsid/d1d2aa95be8351c1c0e06c2e65cdc6ac')

[XT SQL Error]