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', '51tg56gaumhde0pnumj9dqqo27', '54.156.39.245', '1539737150', '1539737150', '/catalog/product_info.php?products_id=791&osCsid=ep84dkdi7gredrjl3ebmugeet6')

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