diff --git a/VAR.Json/ObjectActivator.cs b/VAR.Json/ObjectActivator.cs
index 69ed4f5..52d6588 100644
--- a/VAR.Json/ObjectActivator.cs
+++ b/VAR.Json/ObjectActivator.cs
@@ -6,7 +6,7 @@ namespace VAR.Json
 {
     public class ObjectActivator
     {
-        private static Dictionary<Type, Func<object>> _creators = new Dictionary<Type, Func<object>>();
+        private static readonly Dictionary<Type, Func<object>> _creators = new Dictionary<Type, Func<object>>();
 
         public static Func<object> GetLambdaNew(Type type)
         {
@@ -17,13 +17,18 @@ namespace VAR.Json
 
             lock (_creators)
             {
+                if (_creators.ContainsKey(type))
+                {
+                    return _creators[type];
+                }
+
                 NewExpression newExp = Expression.New(type);
                 LambdaExpression lambda = Expression.Lambda(typeof(Func<object>), newExp);
                 Func<object> compiledLambdaNew = (Func<object>)lambda.Compile();
 
                 _creators.Add(type, compiledLambdaNew);
+                return _creators[type];
             }
-            return _creators[type];
         }
 
         public static object CreateInstance(Type type)