Runtime Error

void Game::doUp()
{
    savedlist = celllist;
    for (int i(0); i<celllist.size(); i++)
    {
        if (testForEmpty(celllist[i]->x, celllist[i]->y-1))
        {
            moveUp(celllist[i]->x, celllist[i]->y-1);
            doUp();
        }
        else if (celllist[findFromList(celllist[i]->x, celllist[i]->y - 1)]->number
                 == celllist[findFromList(celllist[i]->x, celllist[i]->y)]->number)
        {
            connectUp(celllist[i]->x, celllist[i]->y-1);
            doUp();
        }
    }
}
void Game::moveUp(int x, int y)
{
    celllist[findFromList(x, y)]->y--;
}
void Game::connectUp(int x, int y)
{
    celllist[findFromList(x, y-1)]->number += celllist[findFromList(x, y)]->number;
    rem = celllist[findFromList(x, y)];
    celllist.remove(findFromList(x, y));
    delete rem;
    score += celllist[findFromList(x, y-1)]->number;
}