1366 - Incorrect integer value: '' for column `argus_xtc`.`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', 'ihtehd50v1clcib294b37m5gn0', '3.85.143.239', '1558356770', '1558356770', '/shop/product_info.php?info=p7_Kamera-im-Bewegungsmelder-mit-SONY-CCD-420TVL-0-8Lux.html')

[XT SQL Error]