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', '0i849m4f3kb99lpdqp0b9m5si2', '54.145.83.79', '1539694858', '1539694858', '/catalog/shopping_cart.php?osCsid=d3dh6tvlmg0jjepulfb1rvnjq3')

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