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', 'nbelf9r55r6emuege0tfkkaf23', '54.156.51.193', '1537311545', '1537311545', '/catalog/product_info.php?products_id=646&osCsid=bq1vh3pmmdb62gnm62iq9hnsn4')

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