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', 'a4edd744117999de44acd482e6ed0f8c', '54.146.154.243', '1711648994', '1711648994', '/')

[XT SQL Error]