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', 'ctqmid9grm5rs4ap8qnes0prq2', '54.225.26.44', '1539861317', '1539861317', '/catalog/product_info.php?products_id=976&osCsid=gdto7isbeff1bnempgq8p1mgr1')

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