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', 'gf87h2tn921rei1b9qgrpfp6l1', '216.73.216.245', '1752389308', '1752389308', '/xtshop/product_info.php?info=p411_.html')

[XT SQL Error]