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', '56d6037fdb3507c11694e4089459eb16', '216.73.216.158', '1767368299', '1767368299', '/shop/product_info.php/info/p6_BIO---Korianderherzchen-Gro-packung.html')

[XT SQL Error]