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', 'ok3b3v5fjv8f60fbbffhmu2f52', '3.232.96.22', '1611124689', '1611124689', '/')

[XT SQL Error]