debug assertion failed: deque iterator not dereferencable

code compiles and works if i dont have my cout statement. but when i try to cout the front and top element of queue it compiles but has that debug error

Code:

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void wordTest(string search, string temp, int i)
{
        string word;
        set<string> myset;
        set<string>::iterator iter;
        //string temp;
        Stack<string> object;
        queue<Stack<string>> myqueue;

        ifstream infile;
        infile.open("words.txt");

        while (infile >> word)
        {
                myset.insert(word);
        }

                //cout << search << endl;
                iter = myset.find(search);
       
                if (iter != myset.end())
                {
                        //Stack<string> object;
                        object.push(temp);
                        object.push(search);                       
                        myqueue.push(object);
                }
       

        //object.printStack(cout);


        cout << myqueue.front().top();

       
        infile.close();
}

---

Before doing something like myqueue.front(), it is probably a good idea to check myqueue.empty() first. Same thing for your stack.

Also:

Code:

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queue<Stack<string>> myqueue;

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What compiler are you using? I'm pretty sure mine would get confused by that . . . .