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', 'uetgfnrvlut1582u45b57qh0n3', '18.234.88.196', '1558465276', '1558465276', '/lkw_plane_tasche_lkw_plane/product_info.php/info/p154_Tasche-28-20-08-dunkelgr-n-mit-Gecko-in-gelb.html')

[XT SQL Error]