diff --git a/Src/Asp.Net/SqlSugar/ExpressionsToSql/CaseWhen/CaseWhen.cs b/Src/Asp.Net/SqlSugar/ExpressionsToSql/CaseWhen/CaseWhen.cs
index 3e74788e5..7ba270fdc 100644
--- a/Src/Asp.Net/SqlSugar/ExpressionsToSql/CaseWhen/CaseWhen.cs
+++ b/Src/Asp.Net/SqlSugar/ExpressionsToSql/CaseWhen/CaseWhen.cs
@@ -16,6 +16,10 @@ namespace SqlSugar
         {
             return default(T);
         }
+        public T End<T>()
+        {
+            return default(T);
+        }
     }
     public class CaseThen
     {
diff --git a/Src/Asp.Net/SqlSugar/ExpressionsToSql/CaseWhen/CaseWhenResolve.cs b/Src/Asp.Net/SqlSugar/ExpressionsToSql/CaseWhen/CaseWhenResolve.cs
index b309c4105..fe36b158d 100644
--- a/Src/Asp.Net/SqlSugar/ExpressionsToSql/CaseWhen/CaseWhenResolve.cs
+++ b/Src/Asp.Net/SqlSugar/ExpressionsToSql/CaseWhen/CaseWhenResolve.cs
@@ -45,8 +45,15 @@ namespace SqlSugar
             {
                 var isFirst = allMethods.First() == methodExp;
                 var isLast = allMethods.Last() == methodExp;
-                var sql = SubTools.GetMethodValue(this.context, methodExp.Arguments[0], this.context.IsSingle ? ResolveExpressType.WhereSingle : ResolveExpressType.WhereMultiple);
-                sqls.Add(new KeyValuePair<string, string>(methodExp.Method.Name, sql));
+                if (methodExp.Arguments.Count == 0)
+                {
+                    sqls.Add(new KeyValuePair<string, string>(methodExp.Method.Name, "null"));
+                }
+                else
+                {
+                    var sql = SubTools.GetMethodValue(this.context, methodExp.Arguments[0], this.context.IsSingle ? ResolveExpressType.WhereSingle : ResolveExpressType.WhereMultiple);
+                    sqls.Add(new KeyValuePair<string, string>(methodExp.Method.Name, sql));
+                }
             }
             var result = this.context.DbMehtods.CaseWhen(sqls);
             return result;