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', 'erj6p1jt8c5lfao9n7nrtv5gk2', '54.224.56.126', '1539884086', '1539884086', '/catalog/product_info.php?products_id=559&osCsid=pf12o2id5fcu8n8i1od4nkfnu1')

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