diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4003d59..3e6cc28 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,7 @@
 ### Changed
 
 - `HttpClientWebClient` for NET3.5 is now using User-Agent property directly
+- Improved cancelation or disposal of childs when leaving an action
 
 ## 3.2.0 [Release date: 2023-12-06]
 [GitHub Releases](https://github.com/Dynatrace/openkit-dotnet/releases/tag/v3.2.0)
diff --git a/src/Dynatrace.OpenKit/Core/Objects/BaseAction.cs b/src/Dynatrace.OpenKit/Core/Objects/BaseAction.cs
index 0adc00a..e39d41b 100644
--- a/src/Dynatrace.OpenKit/Core/Objects/BaseAction.cs
+++ b/src/Dynatrace.OpenKit/Core/Objects/BaseAction.cs
@@ -18,6 +18,7 @@
 using Dynatrace.OpenKit.Protocol;
 using Dynatrace.OpenKit.Util;
 using System;
+using System.Collections.Generic;
 
 namespace Dynatrace.OpenKit.Core.Objects
 {
@@ -376,6 +377,8 @@ public IAction CancelAction()
 
         private IAction DoLeaveAction(bool discardData)
         {
+            IList<IOpenKitObject> childObjects;
+
             lock (LockObject)
             {
                 if (ThisAction.IsActionLeft)
@@ -385,9 +388,10 @@ private IAction DoLeaveAction(bool discardData)
                 }
 
                 isActionLeft = true;
-            }
 
-            var childObjects = ThisComposite.GetCopyOfChildObjects();
+                childObjects = ThisComposite.GetCopyOfChildObjects();
+            }
+            
             foreach (var childObject in childObjects)
             {
                 if (discardData)
@@ -407,7 +411,7 @@ private IAction DoLeaveAction(bool discardData)
                     childObject.Dispose();
                 }
             }
-
+            
             EndTime = Beacon.CurrentTimestamp;
             EndSequenceNo = Beacon.NextSequenceNumber;
 
diff --git a/src/Dynatrace.OpenKit/Core/Objects/OpenKit.cs b/src/Dynatrace.OpenKit/Core/Objects/OpenKit.cs
index 7cb99d1..210d414 100644
--- a/src/Dynatrace.OpenKit/Core/Objects/OpenKit.cs
+++ b/src/Dynatrace.OpenKit/Core/Objects/OpenKit.cs
@@ -15,6 +15,7 @@
 //
 
 using System;
+using System.Collections.Generic;
 using Dynatrace.OpenKit.API;
 using Dynatrace.OpenKit.Core.Caching;
 using Dynatrace.OpenKit.Core.Configuration;
@@ -214,6 +215,8 @@ public void Shutdown()
                 logger.Debug($"{GetType().Name} shutdown requested");
             }
 
+            IList<IOpenKitObject> childObjects;
+
             lock (lockObject)
             {
                 if (isShutdown)
@@ -222,10 +225,11 @@ public void Shutdown()
                 }
 
                 isShutdown = true;
+
+                childObjects = ThisComposite.GetCopyOfChildObjects();
             }
 
             // close all open children
-            var childObjects = ThisComposite.GetCopyOfChildObjects();
             foreach (var childObject in childObjects)
             {
                 childObject.Dispose();
diff --git a/src/Dynatrace.OpenKit/Core/Objects/Session.cs b/src/Dynatrace.OpenKit/Core/Objects/Session.cs
index 2d0cf75..4e989d3 100644
--- a/src/Dynatrace.OpenKit/Core/Objects/Session.cs
+++ b/src/Dynatrace.OpenKit/Core/Objects/Session.cs
@@ -409,12 +409,18 @@ public void End(bool sendSessionEndEvent)
             // forcefully leave all child elements
             // Since the end time was set, no further child objects are added to the internal list so the following
             // operations are safe outside the lock block.
-            var childObjects = ThisComposite.GetCopyOfChildObjects();
+            IList<IOpenKitObject> childObjects;
+
+            lock (state)
+            {
+                childObjects = ThisComposite.GetCopyOfChildObjects();
+            }
+            
             foreach (var childObject in childObjects)
             {
                 childObject.Dispose();
             }
-
+            
             // send the end event, only if a session is explicitly ended
             if (sendSessionEndEvent)
             {
diff --git a/src/Dynatrace.OpenKit/Core/Objects/SessionProxy.cs b/src/Dynatrace.OpenKit/Core/Objects/SessionProxy.cs
index 9c15b13..22804c5 100644
--- a/src/Dynatrace.OpenKit/Core/Objects/SessionProxy.cs
+++ b/src/Dynatrace.OpenKit/Core/Objects/SessionProxy.cs
@@ -384,6 +384,8 @@ public void End()
                 logger.Debug($"{this} End()");
             }
 
+            IList<IOpenKitObject> childObjects;
+
             lock (lockObject)
             {
                 if (isFinished)
@@ -392,9 +394,10 @@ public void End()
                 }
 
                 isFinished = true;
+
+                childObjects = ThisComposite.GetCopyOfChildObjects();
             }
 
-            var childObjects = ThisComposite.GetCopyOfChildObjects();
             foreach (var childObject in childObjects)
             {
                 if (childObject is ISessionInternals childSession)
@@ -406,7 +409,7 @@ public void End()
                     childObject.Dispose();
                 }
             }
-
+            
             parent.OnChildClosed(this);
             sessionWatchdog.RemoveFromSplitByTimeout(this);
         }