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', 'u82lm7qc75geupid1m0u8ipbv3', '18.234.88.196', '1558465828', '1558465828', '/lkw_plane_tasche_lkw_plane/product_info.php/info/p159_Tasche-30-25-10-braun-wei----mit-Vogel-Strau----in-wei---.html')

[XT SQL Error]