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', '0c2knf9sc6kko4gi03a9f4hgn6', '54.162.133.222', '1539969875', '1539969875', '/catalog/default.php?cPath=52&osCsid=c6vd1j8qd09rntbfnd2sijsee0')

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