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', 'tu9hr1o5hvl2iumelsrf5d24o5', '54.80.87.166', '1540309063', '1540309063', '/catalog/product_info.php?products_id=154&osCsid=mpf5rs1o6rdvmnf89i844k9u07')

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