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', '3kbq4moetmong3s5ihnl01nkv0', '54.166.203.17', '1537466351', '1537466351', '/catalog/product_info.php?products_id=403&osCsid=tpjn88k2pj36mn98jr26octcm7')

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