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', 'kupl1vj699raabsds2jt3iabn4', '54.161.116.225', '1540213259', '1540213259', '/catalog/product_info.php?name=APhiA%20Signature%20Lapel%20Pin&products_id=145')

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