At /umbraco/ucommerce/catalog/editproduct.aspx?id=361&parentcategoryId=117 
  : System.NullReferenceException: Object reference not set to an instance of an object.    
 at UCommerce.EntitiesV2.ProductDescriptionProperty.SetValue(Object value)     
 at UCommerce.Web.UI.Controls.PropertyList.UpdateProperties()     
 at UCommerce.Web.UI.Catalog.EditProductDescription.View_Saving(Object sender, EntityCommandEventArgs`1 e)     
 at System.EventHandler`1.Invoke(Object sender, TEventArgs e)     
 at UCommerce.Web.UI.Catalog.EditProduct.OnSaving(EntityCommandEventArgs`1 e)     
 at UCommerce.Web.UI.Catalog.EditProduct.SaveButton_Clicked(Object sender, ImageClickEventArgs e)     
 at System.Web.UI.WebControls.ImageButton.OnClick(ImageClickEventArgs e)     
 at System.Web.UI.WebControls.ImageButton.RaisePostBackEvent(String eventArgument)     
 at System.Web.UI.WebControls.ImageButton.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument)     
 at System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument)     
 at System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData)     
 at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)

The above issue occurs while editing and saving product in uCommerce section. Please help me.

Thanks in advance.