diff --git a/Src/Asp.Net/SqlServerTest/UnitTest/UCustom012.cs b/Src/Asp.Net/SqlServerTest/UnitTest/UCustom012.cs
index 4e44a72ba..3cda737eb 100644
--- a/Src/Asp.Net/SqlServerTest/UnitTest/UCustom012.cs
+++ b/Src/Asp.Net/SqlServerTest/UnitTest/UCustom012.cs
@@ -89,10 +89,10 @@ namespace OrmTest
             db.Insertable(new Tree1() { Id = 3, Name = "0102", ParentId = 1 }).ExecuteCommand();
             db.Insertable(new Tree1() { Id = 4, Name = "02" }).ExecuteCommand();
             db.Insertable(new Tree1() { Id = 5, Name = "0201", ParentId = 2 }).ExecuteCommand(); 
-            db.Insertable(new Tree1() { Id = 6, Name = "020101", ParentId = 22 }).ExecuteCommand();
+            db.Insertable(new Tree1() { Id = 6, Name = "020101", ParentId = 5 }).ExecuteCommand();
             var list4=db.Queryable<Tree1>()
-                .Includes(it => it.Child,it=>it.Child)
-                .Includes(it => it.Parent,it=>it.Parent)
+                .Includes(it => it.Child,it=>it.Child,it=>it.Child)
+                .Includes(it => it.Parent,it=>it.Parent, it => it.Parent, it => it.Parent)
                 .ToList();
             //var json = db.Utilities.SerializeObject(list4);
         }
diff --git a/Src/Asp.Net/SqlSugar/Abstract/QueryableProvider/NavigatManager.cs b/Src/Asp.Net/SqlSugar/Abstract/QueryableProvider/NavigatManager.cs
index 1db47e3af..2b7406195 100644
--- a/Src/Asp.Net/SqlSugar/Abstract/QueryableProvider/NavigatManager.cs
+++ b/Src/Asp.Net/SqlSugar/Abstract/QueryableProvider/NavigatManager.cs
@@ -68,7 +68,7 @@ namespace SqlSugar
             }
             else if (i == 3)
             {
-                var currentList = _preList;
+                var currentList = _preList.Where(it => it != null).ToList();
                 if (RootList == null || currentList.Count == 0) return;
                 var memberExpression = ((_preExpressionList.Last() as LambdaExpression).Body as MemberExpression);
                 var navObjectName = memberExpression.Member.Name;
@@ -85,7 +85,7 @@ namespace SqlSugar
                     list = currentList.Select(it => (it.GetType().GetProperty(navObjectName).GetValue(it))).ToList();
                 }
                 ExecuteByLay(item, list, SelectR3);
-                _preList = list;
+                _preList = list.ToList();
             }
             _preExpressionList.Add(item);
         }