1366 - Incorrect integer value: '' for column `hbl_shop`.`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', 'n8t9jvfeji603q816lc1k9iet3', '216.73.216.47', '1757805187', '1757805187', '/product_info.php?info=p47_802295-Siphontraenke-30-Liter.html')

[XT SQL Error]