worksheet.ExportData Guid data bug

[mansai]

public Guid? GuidString { get; set; }

`Dictionary<string, string> mappingProperties = new Dictionary<string, string>();
mappingProperties.Add("Brand", "BrandName");
mappingProperties.Add("Vehicle Type", "VehicleType.VehicleName");
mappingProperties.Add("Model", "VehicleType.Model.ModelName");
mappingProperties.Add("GuidString", "GuidString");

List CLRObjects = worksheet.ExportData(4, 1, 141, 4, mappingProperties);`

ExportData.xlsx