diff --git a/src/PSADTree/Commands/GetADTreeGroupMemberCommand.cs b/src/PSADTree/Commands/GetADTreeGroupMemberCommand.cs
index 9f35173..181a617 100644
--- a/src/PSADTree/Commands/GetADTreeGroupMemberCommand.cs
+++ b/src/PSADTree/Commands/GetADTreeGroupMemberCommand.cs
@@ -126,16 +126,22 @@ private void EnumerateMembers(
     {
         foreach (Principal member in searchResult.GetSortedEnumerable(_comparer))
         {
+            IDisposable? disposable = null;
             try
             {
                 if (member is { DistinguishedName: null })
                 {
+                    disposable = member;
                     continue;
                 }
 
-                if (Group.IsPresent && member.StructuralObjectClass != "group")
+                if (member.StructuralObjectClass != "group")
                 {
-                    continue;
+                    disposable = member;
+                    if (Group.IsPresent)
+                    {
+                        continue;
+                    }
                 }
 
                 TreeObjectBase treeObject = ProcessPrincipal(
@@ -151,7 +157,7 @@ private void EnumerateMembers(
             }
             finally
             {
-                member.Dispose();
+                disposable?.Dispose();
             }
         }
     }
diff --git a/src/PSADTree/PSADTree.csproj b/src/PSADTree/PSADTree.csproj
index 55fd80f..4866383 100644
--- a/src/PSADTree/PSADTree.csproj
+++ b/src/PSADTree/PSADTree.csproj
@@ -13,16 +13,19 @@
     <DefineConstants>$(DefineConstants);CORE</DefineConstants>
   </PropertyGroup>
 
+  <ItemGroup Condition=" '$(TargetFramework)' != 'net472' ">
+    <PackageReference Include="System.Security.Principal.Windows" Version="5.0.0"
+      PrivateAssets="all" />
+    <PackageReference Include="System.Management.Automation" Version="7.2.0" PrivateAssets="all" />
+    <PackageReference Include="System.DirectoryServices" Version="6.0.0" PrivateAssets="all" />
+    <PackageReference Include="System.DirectoryServices.AccountManagement" Version="6.0.0"
+      PrivateAssets="all" />
+  </ItemGroup>
+
   <ItemGroup Condition=" '$(TargetFramework)' == 'net472' ">
     <PackageReference Include="PowerShellStandard.Library" Version="5.1.1" PrivateAssets="all" />
     <Reference Include="System.DirectoryServices" PrivateAssets="all" />
     <Reference Include="System.DirectoryServices.AccountManagement" PrivateAssets="all" />
   </ItemGroup>
 
-  <ItemGroup Condition=" '$(TargetFramework)' != 'net472' ">
-    <PackageReference Include="System.Security.Principal.Windows" Version="5.0.0" PrivateAssets="all" />
-    <PackageReference Include="System.Management.Automation" Version="7.2.0" PrivateAssets="all" />
-    <PackageReference Include="System.DirectoryServices" Version="6.0.0" PrivateAssets="all" />
-    <PackageReference Include="System.DirectoryServices.AccountManagement" Version="6.0.0" PrivateAssets="all" />
-  </ItemGroup>
 </Project>
diff --git a/src/PSADTree/PSADTreeComparer.cs b/src/PSADTree/PSADTreeComparer.cs
index 0c99f89..29ace4e 100644
--- a/src/PSADTree/PSADTreeComparer.cs
+++ b/src/PSADTree/PSADTreeComparer.cs
@@ -3,6 +3,7 @@
 
 namespace PSADTree;
 
+#pragma warning disable CS8767
 internal sealed class PSADTreeComparer : IComparer<Principal>
 {
     public int Compare(Principal lhs, Principal rhs) =>
diff --git a/src/PSADTree/TreeGroup.cs b/src/PSADTree/TreeGroup.cs
index 1a46860..32a34e0 100644
--- a/src/PSADTree/TreeGroup.cs
+++ b/src/PSADTree/TreeGroup.cs
@@ -1,6 +1,8 @@
+using System;
 using System.Collections.Generic;
 using System.Collections.ObjectModel;
 using System.DirectoryServices.AccountManagement;
+using System.Text;
 
 namespace PSADTree;
 
@@ -14,6 +16,8 @@ public sealed class TreeGroup : TreeObjectBase
 
     private const string _vtReset = "\x1B[0m";
 
+    private static readonly StringBuilder s_sb = new();
+
     private List<TreeObjectBase>? _childs;
 
     public ReadOnlyCollection<TreeObjectBase> Childs => new(_childs ??= []);
@@ -46,12 +50,13 @@ internal TreeGroup(
     internal void SetCircularNested()
     {
         IsCircular = true;
-        Hierarchy = string.Concat(
-            Hierarchy.Insert(
-                Hierarchy.IndexOf("─ ") + 2,
-                _vtBrightRed),
-            _isCircular,
-            _vtReset);
+        Hierarchy = s_sb
+            .Append(Hierarchy.Insert(Hierarchy.IndexOf("─ ") + 2, _vtBrightRed))
+            .Append(_isCircular)
+            .Append(_vtReset)
+            .ToString();
+
+        s_sb.Clear();
     }
 
     internal void SetProcessed() => Hierarchy = string.Concat(Hierarchy, _isProcessed);