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', '7ecpf81shuopveinlv21s7dq22', '54.198.52.82', '1537747149', '1537747149', '/catalog/product_info.php?name=OMega%20Psi%20Phi%20wood%20Medallion%20W-MED&products_id=897')

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