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', '51m5tlu4ckpmb1g8a2pbs2vko1', '54.158.208.189', '1539630953', '1539630953', '/catalog/product_info.php?products_id=462&osCsid=0ahr33fh7e6njc26oesqkfb591')

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