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', 'f0q7a41vjsfvq489ui71c9f8p0', '54.80.96.153', '1537791012', '1537791012', '/catalog/product_info.php?name=Sigma%20Gamma%20Rho%20Plastic%20License%20Plate%20Holder%20-%20PFBF_4203&products_id=621')

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