1366 - Incorrect integer value: '' for column `dogsdream`.`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', '40bae954e7206f280ef4a67f9adda4b0', '216.73.216.158', '1767368611', '1767368611', '/shop/index.php/cat/c6_Fuer-die--kleinen-.html')

[XT SQL Error]