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', 'd2vhv1nv6k69cc21ql9fknpeo1', '54.198.55.167', '1539754219', '1539754219', '/catalog/product_info.php?products_id=431&osCsid=bq1vh3pmmdb62gnm62iq9hnsn4')

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