Run windows Crashes when executing a delete node function.DLL

main.cpp---------------------------------------

#include "LinkList.h"
#include <iostream>

using namespace std;

int main()
{
    linkedlist obj;
    obj.pushfront(3);
    obj.pushfront(6);
    obj.pushfront(20);
    obj.popback();
    obj.pushfront(5);
    obj.pushback(12);
    obj.popfront();
    obj.deletel(3);


    obj.printlistfromfront();
    obj.printlistfromtail();
    obj.size();

    cin.get();
    return 0;

}

 

Node.h----------------------------------------------------------------

#include <cstddef>
#include <iostream>
using namespace std;

class Node{
public:
    int item;
    Node *next;
    Node *prev;

    friend ostream& operator<< (ostream& print, const Node &value){
    return print << value.item;
    };




    Node(int data){
    item = data;
    next=NULL; //set it = to NULL by default so it doesnt hold a random value
    prev =NULL; //set it = to NULL by default so it doesnt hold a random value
    }
};

LinkList.h------------------------------------------------------------------------------------------------------------

#include "Node.h"
#include <cstddef>
#include<iostream>
using namespace std;

class linkedlist{
public:

    linkedlist(){
    front=NULL;

    };



void pushfront(int item){{
if (front == NULL){
    front =tail = new Node(item);
    front -> next = NULL;
    tail -> prev = NULL;
}
else //or else
{
    Node *temp;
    temp = new Node(item);
    temp -> next = front;
    front -> prev = temp;
    front = temp;
}}
}





void popfront (){
if (front == NULL)
    return;
else
{
    Node *temp;
    temp = front;
    front = front -> next;
    front -> prev = NULL;
    front -> next = (temp-> next)->next;
    delete temp;
}
}



void pushback( int item){
    if (front == NULL){
        front = tail = new Node(item);
        front -> next = NULL;
        tail -> prev = NULL;
}
    else
        {
        Node *temp = new Node(item);
        tail -> next = temp;
        temp -> prev = tail;
        tail = temp;

}
    }



void popback(){
Node* temp = tail;
(temp -> prev) -> next = NULL;
tail = temp -> prev;
delete temp;
}



void printlistfromfront(){
Node* traverse;
traverse = front;
cout << "Items starting from the front of the list are:\a ";
while (traverse != NULL){
    cout <<" " << *traverse;
    traverse = traverse -> next;
}
cout << endl;

}


void printlistfromtail(){
Node *traversle;
traversle = tail;
cout << "Items from the end of the list, going backwards are:\a ";
while (traversle != NULL){
    cout << " " << *traversle;
traversle = traversle -> prev;
}
cout << endl;
}



int size(){
Node* traverse;
int sizel = 0;
traverse = front;
while (traverse != NULL){
    traverse = traverse -> next;


    sizel++;
}
cout << "The size of the list is: "<<sizel<<endl;
return sizel;

}

void deletel(int ith){

if (front == NULL){
    cout<<"there are no nodes to delete.";
    return;
    }
    if ((front -> next == NULL) && (tail -> prev == NULL)){
        front = NULL;
        tail = NULL;}
    else{
            Node *traverse = front;
        int i = 0;
        while (i < ith ){
            traverse = traverse -> next;
            i++;
            }
            (traverse -> prev) -> next = traverse -> next;
            (traverse -> next) -> prev = traverse -> prev;

        }
    }






private:
    Node *front;
    Node *tail;

};

--------------------------------------------------------------------------
For the deletel(); function, it is supposed to delete the ith element in the list. So like either 4th element, 5th element, or second element. But when I run it, the command prompt crashes.