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', '8s4348ivu8lhcoar04i0v4btk0', '54.156.39.245', '1540218156', '1540218156', '/catalog/product_info.php?cPath=54_148&products_id=959&osCsid=57fqfn94okaeh7i3rl213tflo6')

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