1366 - Incorrect integer value: '' for column `hollen`.`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, http_referer) values ('', 'Guest', '3ocfdg6i6v64qcm6ddhs1hq552', '34.204.202.44', '1586458942', '1586458942', '/Produkte/Deutsch:::177_332.html', 'Keiner/None')

[XT SQL Error]