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', 'mqc6ge31479qacmj6b7jn79mo7', '54.161.71.87', '1537335314', '1537335314', '/catalog/shopping_cart.php?osCsid=9163q3pgq67b5j57j0fgqbbhp0')

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