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', 'g8nf01n79elgb56a86kibr2r27', '54.156.39.245', '1539610043', '1539610043', '/catalog/product_info.php?name=Eastern%20Star%20Metal%20License%20Plate%20Holder%20silver-%20DPFS&products_id=688')

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