вот что пишет при попытке фильтрации
This filter does not exist. Did you mean: "id_employee"? The full list is: "id", "id_employee", "id_customer_thread", "ip_address", "message", "file_name", "user_agent", "private", "date_add", "date_upd", "read"
и похоже что id_customer_thread это не id customer