Необработанное исключение

#include <string>
#include <iostream>
 
using std::string; using std::cin; 
using std::endl; using std::cout;
 
struct customer
    {
        char fullname[35];
        double payment;
    };
 
class Stack
{
private:
    customer* stack;
    double summ;
public:
    Stack() {stack->fullname[0] = '\0'; stack->payment = 0;}
    ~Stack() {}
    void Push(customer str)
    {
        cout << "str поставляется в стек.\n";
        cout << "До: stack->fullname = " << stack->fullname << endl;
        cout << "До: stack->payment = " << stack->payment << endl;
        //==========================================================
        customer* stack = new customer;
        strcpy(stack->fullname, str.fullname);
        stack->payment = str.payment;
        //==========================================================
        cout << "После: stack->fullname = " << stack->fullname << endl;
        cout << "После: stack->payment = " << stack->payment << endl;
    }
    void Clear()
    {
        cout << "\nstr удаляется из стека.\n";
        cout << "До: stack->fullname = " << stack->fullname << endl;
        cout << "До: stack->payment = " << stack->payment << endl;
        //=========================================================
        summ += stack->payment;
        delete [] stack;
        //=========================================================
        cout << "После: stack->fullname = " << stack->fullname << endl;
        cout << "После: stack->payment = " << stack->payment << endl;
        cout << "summ = " << summ << endl;
 
    }
};

#include <iostream>
#include <Windows.h>
#include "h.h"
 
#define rus setlocale(0,"rus");SetConsoleCP(1251);SetConsoleOutputCP(1251);
 
using std::cout; using std::cin; using std::endl; using std::string;
 
int main()
{
    Stack Object1;
    customer st1 = {"ABCD EFGH",1234.456};
    Object1.Push(st1);
    Object1.Clear();
    system("pause");
    return 0;
}