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', '4lqgq9c19k4sah25ujsjk34t65', '54.92.164.184', '1537965865', '1537965865', '/catalog/product_info.php?products_id=978&osCsid=7mu73nota6sk5v8739d4a0doc3')

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