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', 'vv7qcljobn8d2s07ce8olp1kn5', '54.81.150.27', '1537445551', '1537445551', '/catalog/product_info.php?name=Iota%20Phi%20Theta%20License%20Plate%20--%20STSR_5107&products_id=975')

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