A Bug of RadUpload in 2016.Q2

I update the dll of uploadhandler of version 2016.Q2. I find a bug of the handler. if I add the code blew in the UploadHandler.ashx. When I upload file, the upload_FileUploaded event can not be hitted. and the upload_FileUploadFailed event be hitted. and not error message. and the file upload to the server successful.  So I use the dll of 2014, it is OK.

public override Dictionary<string, object> GetAssociatedData()
        {
            Dictionary<string, object> dict = base.GetAssociatedData();
            if (!string.IsNullOrEmpty(newFilename))
            {
                dict.Add("NewFilename", this.newFilename);
                dict.Add("oriFilename", this.oriFilename);
            }
            return dict;
        }