Invalid Address specified to RtlFreeHeap on Destructor

[NTL]

I am trying to preserve the original value of an object for use at each iteration of a loop, however on when the elements are deleted which are only in scope of the loop, I get an error which says: "Invalid Address specified to RtlFreeHeap." I can't figure out what I am doing wrong.

Here is a sample of my code:

	void mainTest (Graph_ptr _dataGraph)
	{
		Graph originalDataGraph = (*_dataGraph);

		for(int i=0; i<10; i++)
		{
			Graph dataGraphCopy = originalDataGraph;
			Graph_ptr dataGraph = Graph_ptr(&dataGraphCopy);

                        // do some other things
                }
        }

Note this code works properly if I change the dataGraph definition to:

Graph_ptr dataGraph = _dataGraph;

However, by doing this, I lose the original value of the dataGraph which I need at the start of each loop iteration. Also, Graph_ptr is just a boost pointer of type Graph.

What could be the problem?

Thanks.