c++ NULL terminated array segfault
===

I am writing a program that splits graphs, I got a class
Graph and an Algorithm class. I compute the partitioning in my Algorithm class and split the graph with a method in the Graph class according to the partitioning.

My code looks like this:
In my GraphClass:

    void bisectGraph(int *iPartitioning, Graph **Subgraphs, Edge **Separator){
    ...
        // Store separators in an array
	Separator = new Edge*[Separators.size()+1]; //Separators is a vector containing the separating edges
	if(Separator == NULL)
		writeErrorMsg("Error assigning memory.", "Graph::bisectGraph");
	for(i=0, SepIter = Separators.begin(); SepIter != Separators.end(); i++, SepIter++)
		Separator[i] = *SepIter;
	Separator[Separators.size()] = NULL;

    }

In my Algorithm clas I call it like this:

    Edge** separators;
    Graph** subgraphs;
    int somePartitioning;
    
    g->bisectGraph(somePartitioning, subgraphs, separators);

Works fine so far, but when I want to work on my separators array like this for instance:

    for(int i=0; separators[i]!=NULL, i++){
        ...
    }

I always get a segmentation fault. ddd tells me that at the end of bisectGraph separators contains some content. Since I can't find any other mistake I think i got some concept wrong?