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', '9p0pbkti23fa30aj6rd93futd0', '54.162.171.242', '1534366610', '1534366610', '/catalog/product_info.php?products_id=741&osCsid=igfd37frj5ho3siavik3tg11d0')

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