Hello, after apgrade from release 4.3.3 to release 4.6.4, we have an Exception being thrown in a simple query and here is the error details:

Query : DeliveryDetails Actualused = Xtensive.Orm.Session.Current.Query.All<DeliveryDetails>().Where(x => x.ActualQuantity != null).FirstOrDefault();

Error :
                Unable to translate 'Query.All().Where(x => (x.ActualQuantity != null)).FirstOrDefault()' expression.

Inner Error :
                {"Internal error: Source column list contains null values."}

Stack trace :
                      at Xtensive.Orm.Linq.QueryProvider.Translate[TResult](Expression expression, CompilerConfiguration compilerConfiguration)
   at Xtensive.Orm.Linq.QueryProvider.Translate[TResult](Expression expression)
   at Xtensive.Orm.Linq.QueryProvider.Execute[TResult](Expression expression)
   at System.Linq.Queryable.FirstOrDefault[TSource](IQueryable`1 source)
   at Microtech.Infinity5.Web.Financial.AR.FORM_ProgramSetUp.DisableControls() in E:\Work\Application\Source Code\Microtech.Infinity5.Web\Financial\AR\FORM_ProgramSetUp.aspx.cs:line 382
   at Microtech.Infinity5.Web.Financial.AR.FORM_ProgramSetUp.OnLoad(EventArgs e) in E:\Work\Application\Source Code\Microtech.Infinity5.Web\Financial\AR\FORM_ProgramSetUp.aspx.cs:line 135
   at System.Web.UI.Control.LoadRecursive()
   at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)