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', 'fvuibe1brr4g575nfehckb4pf5', '54.166.207.223', '1539815942', '1539815942', '/catalog/product_info.php?products_id=462&osCsid=almijjqhq4lj5r19iq48tir130')

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