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', '3gfbh5lcdc26gidm85oa3fl356', '2600:1f28:365:80b0:e7b0:4cd3:6926:26e', '1784353925', '1784353925', '/')

[XT SQL Error]