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', 'q5juht04utbomaf5rmfmre9uv3', '2600:1f28:365:80b0:1b4:8158:8ffd:19a2', '1776349981', '1776349981', '/')

[XT SQL Error]