Problems with memory leaks!

Hello!

I am practising for a test in a few days by trying to write code where I just test stuff. 
At the moment I am working with an vector of objects. I have the object Toywhich has the subclass Doll and then the class AnObject which then uses the class Toy to get its toString() and then print it all withAnObjects:s toString().
The user is to be able to create how many AnObject (dumb name, I know) as he pleases, which all will be added to the vectorobject and when the user is done it is to print out all theAnObjects:s using toString(). This all worked well but I was getting memory leaks, so I tried deleting the brought in *Toyobject in my AnObject class but then the program stops with error after the second while-loop. 
Here is the code:

Main:

#include "Toy.h"
#include "Doll.h"
#include "Puzzle.h"
#include <iostream>
#include "AnObject.h"
#include <vector>

using namespace std;

int main(){

	int size = 0;
	int val = 99, runda = 0;
	
	Toy *tTemp = NULL;


	vector<AnObject> object;
	//Toy *temp = NULL;

	while (val != 0){
		cout << "Ange val (1 eller 2): ";
		cin >> val;
		cin.ignore();
		if (val != 0){
			if (val == 1){
				tTemp = new Doll(10, "Stefan", 1, "Ful docka", "XXXXL");
				AnObject tempO = AnObject(10, tTemp);
				object.push_back(tempO);
				//pToy = new AnObject[size];
				//pToy[size-1] = AnObject(10, temp);
				//delete[] temp;
				size++;
			}
		}
		runda++;
	}


	for (int i = 0; i < size; i++){
		cout << object[i].toString();
	}
	delete tTemp;
	/**
	for (int i = 0; i < size; i++){
		cout << pToy[i].toString();//default konstruktorns värden
	}

	for (int i = 0; i < size; i++){
		pToy[i] = Doll(10, "Stefan", 1, "Ful docka", "XXXL");
		cout << pToy[i].toString();

	}**/
	_CrtSetDbgFlag(_CRTDBG_ALLOC_MEM_DF | _CRTDBG_LEAK_CHECK_DF);
	getchar();
}

And then the AnObject.cpp with my destructor where I get the error:

#include "AnObject.h"
#include <sstream>

using namespace std;

AnObject::AnObject(int value, Toy *pos){
	this->pos = pos;
	this->value = value;
}


string AnObject::toString(){
	stringstream sstring;

	sstring << endl << "Value: " << value << pos->toString();

	string result;
	result = sstring.str();
	return result;
}

AnObject::~AnObject(){
	delete pos;
}

The other classes work fine and have virtual destructors so they should be fine, if you want me to show them then I will.
Any help would be much appreciated :)