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', '9r0tv4v50a2p9ulfqjdpvku2i4', '54.198.142.121', '1537916190', '1537916190', '/catalog/product_info.php?products_id=362&osCsid=1u5ppmsfsvv1sbn3fei7luh0d6')

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