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', 'tf76g002m26psdr7bb2qdaa4m5', '54.161.116.225', '1540209419', '1540209419', '/catalog/product_info.php?name=Iota%20Phi%20Theta%20Small%20Paddle%20Acrylic%20%20Keychain%20SPK&products_id=925')

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