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', 'ju2149nsac35rqjrpb9ijh03i6', '3.84.182.112', '1555936409', '1555936409', '/lkw_plane_tasche_lkw_plane/product_info.php/info/p123_Tasche-30-25-10-hellgr-n-dunkelgr-n-mit-Kiwi-in-schwarz.html')

[XT SQL Error]