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', 'kitdmpu0ae51u3eu6108n4vk97', '54.198.212.30', '1539859021', '1539859021', '/catalog/checkout_confirmation.php?osCsid=jtkqf85ibvpt8631l387f535r3')

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