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', 'o5mb21ar18rbold231gmroql22', '34.207.82.217', '1558517078', '1558517078', '/')

[XT SQL Error]