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', 'fl40miepj11enc7ovt012lg1h7', '54.198.142.121', '1537915860', '1537915860', '/catalog/default.php?cPath=47_112&osCsid=8aosvbnconr5alfaaajdsmp0n3')

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