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', 'k52nv7q8iff2h5vkve712jh712', '54.224.89.34', '1539651878', '1539651878', '/catalog/default.php?cPath=52_65&osCsid=mfptrolnqcjru8vljjgdfucg73')

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