1366 - Incorrect integer value: '' for column `drucktiv`.`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', 'dsl729a1123785m4khr9jihqq5', '216.73.216.164', '1758089665', '1758089665', '/')

[XT SQL Error]