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', 'd77t9a6qnjd8f2ugk97eb9tkg1', '54.81.196.35', '1534736489', '1534736489', '/catalog/product_info.php?products_id=979&osCsid=h17pm4hvki90lv2c0hm3b9o272')

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