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', 'gocn94rhrsojo1u793jnb23i86', '216.73.217.35', '1778934283', '1778934283', '/xtshop/create_account.php')

[XT SQL Error]