diff --git a/Src/Asp.Net/SqlSugar/Abstract/SqlBuilderProvider/QueryBuilder.cs b/Src/Asp.Net/SqlSugar/Abstract/SqlBuilderProvider/QueryBuilder.cs
index 6ac738a32..eabea401f 100644
--- a/Src/Asp.Net/SqlSugar/Abstract/SqlBuilderProvider/QueryBuilder.cs
+++ b/Src/Asp.Net/SqlSugar/Abstract/SqlBuilderProvider/QueryBuilder.cs
@@ -401,6 +401,10 @@ namespace SqlSugar
         {
             var expression = this.SelectValue as Expression;
             var result = GetExpressionValue(expression, this.SelectType).GetResultString();
+            if (result == null)
+            {
+                return "*";
+            }
             if (result.Contains(".*") && this.IsSingle())
             {
                 return "*";
diff --git a/Src/Asp.Net/SqlSugar/Entities/MapperCache.cs b/Src/Asp.Net/SqlSugar/Entities/MapperCache.cs
index 5d1699725..f8024862c 100644
--- a/Src/Asp.Net/SqlSugar/Entities/MapperCache.cs
+++ b/Src/Asp.Net/SqlSugar/Entities/MapperCache.cs
@@ -1,7 +1,6 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
-using System.Linq.Expressions;
 using System.Text;
 
 namespace SqlSugar
@@ -35,10 +34,6 @@ namespace SqlSugar
                 return result;
             }
         }
-        private static Expression<Func<List<T>, Result>> FuncToExpression<Result>(Func<List<T>, Result> f)
-        {
-            return x => f(x);
-        }
         public List<Result> GetListByPrimaryKeys<Result>(Func<T, double?> action) where Result : class, new()
         {
             {