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', 'kucsi1nt7jfo5bdhgh1pm6g6d4', '54.224.247.42', '1539995166', '1539995166', '/catalog/product_info.php?products_id=979&osCsid=nfii3vtmlbkfrou0ufui8tluf3')

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