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', 'v3clvbtpc7hfn2tb5ulmtks4p2', '54.162.239.233', '1537822412', '1537822412', '/catalog/product_info.php?products_id=375&osCsid=1u5ppmsfsvv1sbn3fei7luh0d6')

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