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', '7lbo4ppfdriphctbgdnfkn27g6', '54.224.220.72', '1534761013', '1534761013', '/catalog/product_info.php?products_id=421&osCsid=ubrdssd4s064q9i1qstrtsn7l3')

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