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System.NullReferenceException: Object reference not set to an instance of an object.
   at lambda_method(Closure )
   at Umbraco.Core.Persistence.Querying.PocoToSqlExpressionVisitor`1.VisitMemberAccess(MemberExpression m)
   at Umbraco.Core.Persistence.Querying.ExpressionVisitorBase.Visit(Expression expression)
   at Umbraco.Core.Persistence.Querying.ExpressionVisitorBase.VisitBinary(BinaryExpression b)
   at Umbraco.Core.Persistence.Querying.ExpressionVisitorBase.Visit(Expression expression)
   at Umbraco.Core.Persistence.Querying.ExpressionVisitorBase.VisitBinary(BinaryExpression b)
   at Umbraco.Core.Persistence.Querying.ExpressionVisitorBase.Visit(Expression expression)
   at Umbraco.Core.Persistence.Querying.ExpressionVisitorBase.VisitLambda(LambdaExpression lambda)
   at Umbraco.Core.Persistence.Querying.ExpressionVisitorBase.Visit(Expression expression)
   at Umbraco.Core.Persistence.PetaPocoSqlExtensions.Where[T](Sql sql, Expression`1 predicate, ISqlSyntaxProvider sqlSyntax)
   at CCB.Web.Services.CustomFormService.GetById(Int32 formId) in D:\Work\CCB\CCB.Web\Services\CustomFormService.cs:line 77
   at ASP._Page_app_plugins_customforms_views_form_cshtml.Execute() in F:\WebSites\Web\CCB\app_plugins\customforms\views\form.cshtml:line 37
   at System.Web.WebPages.WebPageBase.ExecutePageHierarchy()
   at System.Web.Mvc.WebViewPage.ExecutePageHierarchy()
   at System.Web.WebPages.WebPageBase.ExecutePageHierarchy(WebPageContext pageContext, TextWriter writer, WebPageRenderingBase startPage)
   at System.Web.Mvc.RazorView.RenderView(ViewContext viewContext, TextWriter writer, Object instance)
   at System.Web.Mvc.BuildManagerCompiledView.Render(ViewContext viewContext, TextWriter writer)
   at Umbraco.Core.Profiling.ProfilingView.Render(ViewContext viewContext, TextWriter writer)
   at System.Web.Mvc.HtmlHelper.RenderPartialInternal(String partialViewName, ViewDataDictionary viewData, Object model, TextWriter writer, ViewEngineCollection viewEngineCollection)
   at System.Web.Mvc.Html.PartialExtensions.Partial(HtmlHelper htmlHelper, String partialViewName, Object model, ViewDataDictionary viewData)
   at System.Web.Mvc.Html.PartialExtensions.Partial(HtmlHelper htmlHelper, String partialViewName, Object model)
   at ASP._Page_Views_Partials_grid_editors_base_cshtml.Execute() in F:\WebSites\Web\CCB\Views\Partials\grid\editors\base.cshtml:line 20