1366 - Incorrect integer value: '' for column `agentur`.`whos_online`.`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', 'b2jge0rptaq6em9uk4ti2kq1n3', '18.234.247.75', '1611798286', '1611798286', '/')

[XT SQL Error]