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', 'tmb5pabs9qdl64t3b68cmqnie3', '100.26.176.182', '1576355577', '1576355577', '/')

[XT SQL Error]