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', 'kfl2cfqmfprfuu20lhlkvk11j1', '54.92.190.11', '1537326839', '1537326839', '/catalog/product_info.php?products_id=982&osCsid=tpjn88k2pj36mn98jr26octcm7')

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