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', '5t54iiq9170ndrs8nof58f6hs5', '54.156.39.245', '1539612549', '1539612549', '/catalog/product_info.php?name=Alpha%20Phi%20Alpha%20Domed%20Paddle%20560&products_id=942')

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