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', 'kc3a9pqk665abuvjlgfunj8t21', '54.158.199.217', '1537896573', '1537896573', '/catalog/privacy.php?osCsid=9rumv2h8ncjnnk4jirmr7aju45')

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