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', 'pkq9gbrf2qqv12qb67hat4rfa2', '54.158.208.189', '1539629339', '1539629339', '/catalog/product_info.php?products_id=431&osCsid=ei044e6m57a1he3f8bb8tt33u1')

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