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', 'fadgn1nk8is7f571ju4rnv5fn2', '54.224.247.42', '1539810366', '1539810366', '/catalog/product_info.php?products_id=149&osCsid=0ahr33fh7e6njc26oesqkfb591')

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