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', '0ob4evq2d3icudmp45bclc6k46', '54.224.247.42', '1539953786', '1539953786', '/catalog/default.php?cPath=50&osCsid=d4ngsa8o65960em7hi775spb82')

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