diff --git a/dopt.DeltaBarth.Tests/PluginTest.cs b/dopt.DeltaBarth.Tests/PluginTest.cs
index f28e047..614e7ce 100644
--- a/dopt.DeltaBarth.Tests/PluginTest.cs
+++ b/dopt.DeltaBarth.Tests/PluginTest.cs
@@ -252,5 +252,20 @@ namespace dopt.DeltaBarth.Tests
             Assert.AreEqual((int)StatusCodes.VerbindungTimeout, res.status.code);
             test.Dispose();
         }
+        [TestMethod]
+        public void Umsatzprognose_WithoutCompanyIdWithValidDate_Test_DoubleDispose()
+        {
+            var test = new TPlugin();
+            string apiUrlSet = config.apiUrl, user = config.username, password = config.password, database = config.database, mandant = config.mandant;
+            test.Startup(baseDataPath, apiUrlSet, user, password, database, mandant);
+            var date = new DateTime(2015, 1, 1, 12, 45, 30);
+            var res = test.Umsatzprognose(null, date);
+            PrettyPrint(res);
+            Assert.AreEqual(1, res.status.code);
+            Assert.AreEqual((int)StatusCodes.VerbindungTimeout, res.status.code);
+            test.Dispose();
+            test.Dispose();
+            Console.WriteLine("After double dispose");
+        }
     }
 }
diff --git a/dopt.DeltaBarth/Plugin.cs b/dopt.DeltaBarth/Plugin.cs
index e1e8bf5..42682a5 100644
--- a/dopt.DeltaBarth/Plugin.cs
+++ b/dopt.DeltaBarth/Plugin.cs
@@ -93,7 +93,7 @@ namespace dopt.DeltaBarth
         /// </summary>
         /// <param name="runtimePath">Der Pfad zur Python-Runtime. Dieser muss zu dem Ordner zeigen, 
         /// in welchem die Runtime in Form eines Ordners mit dem Namen "python" abliegt.</param>
-        public Plugin(string runtimePath) : base(SharpPython.PyOptimLevels.O, runtimePath: runtimePath, verbose: false) 
+        public Plugin(string runtimePath) : base(SharpPython.PyOptimLevels.O, threaded: true, runtimePath: runtimePath, verbose: false) 
         {
             base.Initialise();
             using (Py.GIL())
diff --git a/dopt.DeltaBarth/dopt.DeltaBarth.csproj b/dopt.DeltaBarth/dopt.DeltaBarth.csproj
index 77bb443..d7dab4e 100644
--- a/dopt.DeltaBarth/dopt.DeltaBarth.csproj
+++ b/dopt.DeltaBarth/dopt.DeltaBarth.csproj
@@ -11,7 +11,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="dopt.SharpPython" Version="0.4.1" />
+    <PackageReference Include="dopt.SharpPython" Version="0.4.2-alpha3" />
   </ItemGroup>
 
 </Project>