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', 'lda84f0mpegs10iae9ic9c53t2', '3.84.182.112', '1555936427', '1555936427', '/lkw_plane_tasche_lkw_plane/product_info.php/info/p112_Tasche-30-25-10-blau-mit-gelben-Stern.html')

[XT SQL Error]