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', 'hjrmfj5ucqtpm10r9tgrq0hld2', '54.158.52.166', '1537360227', '1537360227', '/catalog/shopping_cart.php?osCsid=pdr0mj2h13soa6rtgdr58h9220')

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