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', '3cni3e8l3blms3u2n5tiaikd45', '54.158.208.189', '1539634105', '1539634105', '/catalog/contact_us.php?osCsid=8mk4329059mvln86ac9ttoajc3')

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