diff --git a/src/wrapper.h b/src/wrapper.h
index 5933e09..5697526 100644
--- a/src/wrapper.h
+++ b/src/wrapper.h
@@ -65,28 +65,19 @@ public:
 
 	Wrapper(const Wrapper & wrapper)
 	{
-		operator=(wrapper);
+		model = nullptr;
+		model_container_wrapper = nullptr;
+		date = nullptr;
+		space_wrapper = nullptr;
+
+		copy(wrapper);
 	}
 
 
 	Wrapper & operator=(const Wrapper & wrapper)
 	{
-		model = wrapper.model;
-		model_container_wrapper = wrapper.model_container_wrapper;
-		date = wrapper.date;
-		space_wrapper = wrapper.space_wrapper;
-
-		if( model_container_wrapper )
-		{
-			model_container_wrapper->increment_reference_counter();
-		}
-
-		if( space_wrapper )
-		{
-			space_wrapper->increment_reference_counter();
-		}
-
-		// childs_map don't need to be copied
+		clear();
+		copy(wrapper);
 
 		return *this;
 	}
@@ -129,7 +120,6 @@ public:
 	}
 
 
-
 	virtual void clear_childs()
 	{
 		childs_map.clear();
@@ -174,6 +164,26 @@ private:
 
 	std::map<std::wstring, Wrapper> childs_map;
 
+
+	void copy(const Wrapper & wrapper)
+	{
+		model = wrapper.model;
+		model_container_wrapper = wrapper.model_container_wrapper;
+		date = wrapper.date;
+		space_wrapper = wrapper.space_wrapper;
+
+		if( model_container_wrapper )
+		{
+			model_container_wrapper->increment_reference_counter();
+		}
+
+		if( space_wrapper )
+		{
+			space_wrapper->increment_reference_counter();
+		}
+
+		// childs_map don't need to be copied
+	}
 };