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', '3s6pr4dms4oge2bq649reui993', '2600:1f28:365:80b0:98c3:3d83:c0f2:71dd', '1783812609', '1783812609', '/')

[XT SQL Error]