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', 'nk1h3f8hru3gft28gsaplan513', '54.80.96.153', '1537787075', '1537787075', '/catalog/product_info.php?name=Z%20Phi%20B%20Graduation%20Stole%2098526&products_id=855')

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