diff --git a/mROA/Abstract/IExecuteModule.cs b/mROA/Abstract/IExecuteModule.cs
index c45a378..54d4904 100644
--- a/mROA/Abstract/IExecuteModule.cs
+++ b/mROA/Abstract/IExecuteModule.cs
@@ -4,7 +4,7 @@ namespace mROA.Abstract
 {
     public interface IExecuteModule
     {
-        ICommandExecution Execute(ICallRequest command, IInstanceRepository instanceRepository,
+        ICommandExecution? Execute(ICallRequest command, IInstanceRepository instanceRepository,
             IRepresentationModule representationModule, IEndPointContext context);
     }
 }
\ No newline at end of file
diff --git a/mROA/Implementation/Backend/BasicExecutionModule.cs b/mROA/Implementation/Backend/BasicExecutionModule.cs
index 53b8937..166cf22 100644
--- a/mROA/Implementation/Backend/BasicExecutionModule.cs
+++ b/mROA/Implementation/Backend/BasicExecutionModule.cs
@@ -19,7 +19,7 @@ namespace mROA.Implementation.Backend
             _serialization = serialization;
         }
 
-        public ICommandExecution Execute(ICallRequest command, IInstanceRepository instanceRepository,
+        public ICommandExecution? Execute(ICallRequest command, IInstanceRepository instanceRepository,
             IRepresentationModule representationModule, IEndPointContext endPointContext)
         {
             // _logger.LogInformation("Executing {0}", command.Id);
@@ -63,7 +63,7 @@ namespace mROA.Implementation.Backend
             }
         }
 
-        private ICommandExecution ExecuteRequest(ICallRequest command, IInstanceRepository instanceRepository,
+        private ICommandExecution? ExecuteRequest(ICallRequest command, IInstanceRepository instanceRepository,
             IRepresentationModule representationModule, IEndPointContext endPointContext, IMethodInvoker invoker,
             object context, object?[]? castedParams, RequestContext execContext)
         {
@@ -122,14 +122,14 @@ namespace mROA.Implementation.Backend
             };
         }
 
-        private static ICommandExecution Execute(MethodInvoker invoker, object instance, object?[] parameter,
+        private static ICommandExecution? Execute(MethodInvoker invoker, object instance, object?[] parameter,
             ICallRequest command, RequestContext executionContext)
         {
             var finalResult = invoker.Invoke(instance, parameter, new object[] { executionContext });
 
             if (!invoker.IsTrusted)
             {
-                return new AsyncCommandExecution();
+                return null;
             }
 
             if (invoker.IsVoid)
@@ -147,7 +147,7 @@ namespace mROA.Implementation.Backend
             };
         }
 
-        private ICommandExecution ExecuteAsync(AsyncMethodInvoker invoker, object instance, object?[]? parameters,
+        private ICommandExecution? ExecuteAsync(AsyncMethodInvoker invoker, object instance, object?[]? parameters,
             ICallRequest command, ICancellationRepository cancellationRepository,
             IRepresentationModule representationModule, RequestContext executionContext, IEndPointContext context)
         {
@@ -172,13 +172,11 @@ namespace mROA.Implementation.Backend
                         payload, context);
             });
 
-            return new AsyncCommandExecution
-            {
-                Id = command.Id
-            };
+
+            return null;
         }
 
-        private ICommandExecution TypedExecuteAsync(AsyncMethodInvoker invoker, object instance, object?[]? parameters,
+        private ICommandExecution? TypedExecuteAsync(AsyncMethodInvoker invoker, object instance, object?[]? parameters,
             ICallRequest command, ICancellationRepository cancellationRepository,
             IRepresentationModule representationModule, RequestContext executionContext, IEndPointContext context)
         {
@@ -201,10 +199,7 @@ namespace mROA.Implementation.Backend
                         payload, context);
                 });
 
-            return new AsyncCommandExecution
-            {
-                Id = command.Id
-            };
+            return null;
         }
     }
 }
\ No newline at end of file
diff --git a/mROA/Implementation/CommandExecution/AsyncCommandExecution.cs b/mROA/Implementation/CommandExecution/AsyncCommandExecution.cs
deleted file mode 100644
index 768668a..0000000
--- a/mROA/Implementation/CommandExecution/AsyncCommandExecution.cs
+++ /dev/null
@@ -1,11 +0,0 @@
-using System;
-using mROA.Abstract;
-
-namespace mROA.Implementation.CommandExecution
-{
-    public class AsyncCommandExecution : ICommandExecution
-    {
-        public RequestId Id { get; set; }
-        public EMessageType MessageType => EMessageType.Unknown;
-    }
-}
\ No newline at end of file
diff --git a/mROA/Implementation/Frontend/RequestExtractor.cs b/mROA/Implementation/Frontend/RequestExtractor.cs
index f13afe1..a6b0f62 100644
--- a/mROA/Implementation/Frontend/RequestExtractor.cs
+++ b/mROA/Implementation/Frontend/RequestExtractor.cs
@@ -76,14 +76,13 @@ namespace mROA.Implementation.Frontend
         private void HandleCallRequest(DefaultCallRequest request)
         {
             var result = _executeModule.Execute(request, _context.RealRepository, _representationModule, _context);
-
-            var resultType = result.MessageType;
-
-            if (resultType == EMessageType.Unknown)
+            
+            if (result is null)
             {
                 return;
             }
 
+            var resultType = result.MessageType;
             _representationModule.PostCallMessageAsync(request.Id, resultType, result, _context).ConfigureAwait(false);
         }