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', '9p71hebhjin289va4klp8scir7', '54.92.160.119', '1540069019', '1540069019', '/catalog/product_info.php?products_id=944&osCsid=nfa2157thpsc5bi2muj2o87fd6')

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