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', 'nsnu8bmgdufstuqlsg5tfh4sh1', '54.80.96.153', '1537615074', '1537615074', '/catalog/shopping_cart.php?osCsid=rrjc2i210c15dmtglnfnkm4146')

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