diff --git a/Src/Asp.Net/SqlSugar/Interface/ISimpleClient.cs b/Src/Asp.Net/SqlSugar/Interface/ISimpleClient.cs
index 14093c056..573c033f4 100644
--- a/Src/Asp.Net/SqlSugar/Interface/ISimpleClient.cs
+++ b/Src/Asp.Net/SqlSugar/Interface/ISimpleClient.cs
@@ -8,7 +8,7 @@ namespace SqlSugar
 {
     public interface ISimpleClient<T> where T : class, new()
     {
-        ISqlSugarClient CopyNew();
+        SimpleClient<T> CopyNew();
         RepositoryType CopyNew<RepositoryType>() where RepositoryType : ISugarRepository;
         SimpleClient<ChangeType> Change<ChangeType>() where ChangeType : class, new();
         RepositoryType ChangeRepository<RepositoryType>() where RepositoryType : ISugarRepository ;
diff --git a/Src/Asp.Net/SqlSugar/SimpleClient.cs b/Src/Asp.Net/SqlSugar/SimpleClient.cs
index bb30d331d..0af7316d5 100644
--- a/Src/Asp.Net/SqlSugar/SimpleClient.cs
+++ b/Src/Asp.Net/SqlSugar/SimpleClient.cs
@@ -36,10 +36,11 @@ namespace SqlSugar
         {
             return this.Context.GetSimpleClient<ChangeType>();
         }
-        public ISqlSugarClient CopyNew() 
+        public SimpleClient<T> CopyNew() 
         {
-            this.Context = this.Context.CopyNew();
-            return this.Context;
+            SimpleClient<T> sm = new SimpleClient<T>();
+            sm.Context = this.Context.CopyNew();
+            return sm;
         }
         public RepositoryType CopyNew<RepositoryType>() where RepositoryType : ISugarRepository 
         {
diff --git a/Src/Asp.NetCore2/SqlSugar/Utilities/UtilMethods.cs b/Src/Asp.NetCore2/SqlSugar/Utilities/UtilMethods.cs
index f36fa9526..aaf48c68f 100644
--- a/Src/Asp.NetCore2/SqlSugar/Utilities/UtilMethods.cs
+++ b/Src/Asp.NetCore2/SqlSugar/Utilities/UtilMethods.cs
@@ -19,7 +19,15 @@ namespace SqlSugar
     {
         internal static void EndCustomSplitTable(ISqlSugarClient context,Type entityType)
         {
+            if (context == null || entityType == null) 
+            {
+                return;
+            }
             var splitTableAttribute = entityType.GetCustomAttribute<SplitTableAttribute>();
+            if (splitTableAttribute == null) 
+            {
+                return;
+            }
             if (splitTableAttribute.CustomSplitTableService != null)
             {
                 context.CurrentConnectionConfig.ConfigureExternalServices.SplitTableService = null;
@@ -28,6 +36,15 @@ namespace SqlSugar
 
         internal static void StartCustomSplitTable(ISqlSugarClient context, Type entityType)
         {
+            if (context == null || entityType == null)
+            {
+                return;
+            }
+            var splitTableAttribute = entityType.GetCustomAttribute<SplitTableAttribute>();
+            if (splitTableAttribute == null)
+            {
+                return;
+            }
             var splitTableAttribute = entityType.GetCustomAttribute<SplitTableAttribute>();
             if (splitTableAttribute.CustomSplitTableService != null)
             {