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', '348fnsf0f8743vq2strgo671b4', '34.204.202.44', '1586463732', '1586463732', '/Produkte/Mathematik/Mathekartei-Klasse-1::2185.html', 'Keiner/None')

[XT SQL Error]