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', 'm5ic2ftpo0mneok2tfn01i5cu0', '54.166.207.223', '1539814043', '1539814043', '/catalog/privacy.php?osCsid=3h61g3e27qtgvreaperqii5g47')

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