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', 'mf9lcb0jth1isnaal8imf0n8q0', '54.158.208.189', '1539633523', '1539633523', '/catalog/product_info.php?cPath=50_139&products_id=476&osCsid=ee38dm5cms5kmplgvc93m6evi5')

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