diff --git a/Src/Asp.Net/SqlServerTest/Demo/Demo1_Queryable.cs b/Src/Asp.Net/SqlServerTest/Demo/Demo1_Queryable.cs
index bbd1a0265..f1a07abd1 100644
--- a/Src/Asp.Net/SqlServerTest/Demo/Demo1_Queryable.cs
+++ b/Src/Asp.Net/SqlServerTest/Demo/Demo1_Queryable.cs
@@ -124,6 +124,11 @@ namespace OrmTest
             Console.WriteLine("#### SqlFunc Start ####");
             var db = GetInstance();
             var index= db.Queryable<Order>().Select(it => SqlFunc.CharIndex("a", "cccacc")).First();
+            var list = db.Queryable<Order>().Select(it =>new ViewOrder()
+            {
+
+                Id = SqlFunc.AggregateSum(SqlFunc.IF(it.Id > 0).Return(1).End(0))
+            }).ToList();
 
             Console.WriteLine("#### SqlFunc  End ####");
         }
diff --git a/Src/Asp.Net/SqlSugar/ExpressionsToSql/CaseWhen/CaseWhenResolve.cs b/Src/Asp.Net/SqlSugar/ExpressionsToSql/CaseWhen/CaseWhenResolve.cs
index fe36b158d..de7e7ad78 100644
--- a/Src/Asp.Net/SqlSugar/ExpressionsToSql/CaseWhen/CaseWhenResolve.cs
+++ b/Src/Asp.Net/SqlSugar/ExpressionsToSql/CaseWhen/CaseWhenResolve.cs
@@ -26,7 +26,10 @@ namespace SqlSugar
             }
             else if (context.IsSingle)
             {
-                this.context.SingleTableNameSubqueryShortName = (context.Expression as LambdaExpression).Parameters.First().Name;
+                if ((context.Expression as LambdaExpression) != null)
+                {
+                    this.context.SingleTableNameSubqueryShortName = (context.Expression as LambdaExpression).Parameters.First().Name;
+                }
             }
             while (currentExpression != null)
             {