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', 'f0e9gf5bif9as5a20q9acp30p3', '52.15.154.142', '1746783985', '1746783985', '/xtshop/display_vvcodes.php')

[XT SQL Error]