diff --git a/mocha-dotnet/src/lib/Mocha.Core/Oop/ConcreteInstanceWrapper.cs b/mocha-dotnet/src/lib/Mocha.Core/Oop/ConcreteInstanceWrapper.cs
index a25597a..33201b6 100644
--- a/mocha-dotnet/src/lib/Mocha.Core/Oop/ConcreteInstanceWrapper.cs
+++ b/mocha-dotnet/src/lib/Mocha.Core/Oop/ConcreteInstanceWrapper.cs
@@ -24,11 +24,22 @@ public abstract class ConcreteInstanceWrapper : InstanceWrapper
         {
             if (methodType.IsAbstract)
                 continue;
-                
-            ConcreteInstanceWrapper m = (ConcreteInstanceWrapper)methodType.Assembly.CreateInstance(methodType.FullName, false, System.Reflection.BindingFlags.Public | System.Reflection.BindingFlags.NonPublic | System.Reflection.BindingFlags.Instance, null, new object[] { methodInstance }, null, null);
-            if (m.ClassId == oms.GetGlobalIdentifier(parentClass))
+
+            ConcreteInstanceWrapper m = null;
+            try
             {
-                return m;
+                m = (ConcreteInstanceWrapper)methodType.Assembly.CreateInstance(methodType.FullName, false, System.Reflection.BindingFlags.Public | System.Reflection.BindingFlags.NonPublic | System.Reflection.BindingFlags.Instance, null, new object[] { methodInstance }, null, null);
+            }
+            catch (Exception ex)
+            {
+
+            }
+            if (m != null)
+            {
+                if (m.ClassId == oms.GetGlobalIdentifier(parentClass))
+                {
+                    return m;
+                }
             }
         }
         return null;