1366 - Incorrect integer value: '' for column `artcom-ug`.`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', '5ktcp99svccgt6kfqjscbk2r10', '18.119.137.2', '1718734640', '1718734640', '/product_info.php?info=p19842_Palit+PCI-E+NV+GT520+1024Mb+64bit+%28TC%29+DDR3+HDMI+DVI+CRT+bulk.html')

[XT SQL Error]