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', '550e6719897b6c4b224bbda2d09ca3cb', '34.229.24.100', '1563484880', '1563484880', '/')

[XT SQL Error]