[InvalidOperationException: The cast to value type 'System.Decimal' failed because the materialized value is null. Either the result type's generic parameter or the query must use a nullable type.]
System.Data.Entity.Core.Common.Internal.Materialization.ErrorHandlingValueReader`1.GetValue(DbDataReader reader, Int32 ordinal) +117
lambda_method(Closure , Shaper ) +105
System.Data.Entity.Core.Common.Internal.Materialization.Coordinator`1.ReadNextElement(Shaper shaper) +207
System.Data.Entity.Core.Common.Internal.Materialization.SimpleEnumerator.MoveNext() +78
System.Data.Entity.Internal.LazyEnumerator`1.MoveNext() +100
System.Linq.Enumerable.Single(IEnumerable`1 source) +119
System.Data.Entity.Core.Objects.ELinq.ObjectQueryProvider.<GetElementFunction>b__3(IEnumerable`1 sequence) +4
System.Data.Entity.Core.Objects.ELinq.ObjectQueryProvider.ExecuteSingle(IEnumerable`1 query, Expression queryRoot) +30
System.Data.Entity.Core.Objects.ELinq.ObjectQueryProvider.System.Linq.IQueryProvider.Execute(Expression expression) +64
System.Data.Entity.Internal.Linq.DbQueryProvider.Execute(Expression expression) +90
System.Linq.Queryable.Sum(IQueryable`1 source) +160
WebApplication.TemplateKategorie.NactiDynamickyRemarketing() in C:\Projects WebForms\EvolutionGroupSK\WebApplication\TemplateKategorie.aspx.cs:405
WebApplication.TemplateKategorie.Page_Load(Object sender, EventArgs e) in C:\Projects WebForms\EvolutionGroupSK\WebApplication\TemplateKategorie.aspx.cs:44
System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +52
System.Web.UI.Control.OnLoad(EventArgs e) +97
System.Web.UI.Control.LoadRecursive() +61
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +693
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