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', '4mu5823s2fd1k8csgotvhi84c1', '54.166.203.17', '1537321684', '1537321684', '/catalog/checkout_confirmation.php?osCsid=4idg8if14sgdtl63grjalkt673')

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