1366 - Incorrect integer value: '' for column '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', 'g33hjrj2krnoqae6l787t670o2', '18.234.88.196', '1558467435', '1558467435', '/lkw_plane_tasche_lkw_plane/product_info.php/info/p10_30-38-10-braun-braun--Katze-beige.html')

[XT SQL Error]