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', 'mll15cfuuq3rp57rrd7ossh5s3', '54.156.39.245', '1540221162', '1540221162', '/catalog/checkout_confirmation.php?osCsid=vtq0ta32al27fqmf1aa60g7060')

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