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', 'k1fjhkvhmo4dd95hndr2u2q5n4', '54.156.39.245', '1540221066', '1540221066', '/catalog/shopping_cart.php?page=1&osCsid=db626d7o9vdlv30uj3khnc80k0')

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