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', 'jvp40nql5iil5d1s93jbu0k7o0', '18.234.88.196', '1558465211', '1558465211', '/lkw_plane_tasche_lkw_plane/product_info.php/info/p118_Tasche-30-38-10-rot-braun-mit-wei-em-Ahorn.html')

[XT SQL Error]