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', 'fum39feha0ue02l6dm32eehfd0', '54.156.51.193', '1537339158', '1537339158', '/catalog/product_info.php?products_id=433&osCsid=fi3j8ufkg5ss99gu0oqi36m9v4')

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