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', 'rt9ge1984llpt4hh8v0rdknjq4', '54.166.207.223', '1539814324', '1539814324', '/catalog/shipping.php?osCsid=3h61g3e27qtgvreaperqii5g47')

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