Hello guys my console crashes when I try to run this code

Code:
#include "stdafx.h"
#include <stdio.h>
#include <iostream>


#define MAX_ITEMS 10



struct CircularQueue
{
    int first;
    int last;
    int validItems;
    int data[MAX_ITEMS];
};


void initiliazeQueue(CircularQueue* queue)
{
    queue->validItems = 0;
    queue->first = 0;
    queue->last = 0;


    for (int i = 0; i < MAX_ITEMS; i++)
    {
        queue->data[i] = 0;
    }


}


int isEmpty(CircularQueue* queue)
{
    if (queue->validItems == 0)
        return 1;
    else
        return 0;
}


int enqueue(CircularQueue* queue, int itemValue)
{
    if (queue->validItems >= MAX_ITEMS)
    {
        std::cout << "The queue is full\n";
        std::cout << "\You cannot add items\n";
        return -1;
    }
    else
    {
        queue->validItems++;
        queue->data[queue->last] = itemValue;
        queue->last = (queue->last + 1) % MAX_ITEMS;
        return 0;
    }
}


int dequeue(CircularQueue* queue, int* itemValue)
{
    if (isEmpty(queue))
    {
        printf("is empty\n");
        return -1;
    }
    else
    {
        *itemValue = queue->data[queue->first];
        queue->first = (queue->first + 1) % MAX_ITEMS;
        queue->validItems--;
        return 0;
    }
}


void printQueue(CircularQueue* queue)
{
    int aux, aux1;
    aux = queue->first;
    aux1 = queue->validItems;
    while (aux1>0)
    {
        printf("Element #%d = %d\n", aux, queue->data[aux]);
        aux = (aux + 1) % MAX_ITEMS;
        aux1--;
    }
    return;
}


using namespace std;


int main()
{
    CircularQueue* circularQueue = new CircularQueue;
    initiliazeQueue(circularQueue);
    int* buffer = NULL;


    if (isEmpty(circularQueue))
        std::cout << "Queue is empty" << endl;
     
    enqueue(circularQueue, 5);
    enqueue(circularQueue, 12);
    printQueue(circularQueue);


    if (isEmpty(circularQueue) == -1)
        std::cout << "Queue is empty" << endl;


    

    dequeue(circularQueue, buffer);
    std::cout << "After dequeue" << endl;
    printQueue(circularQueue);


    return 0;
}
This line is doing problems, so I tried to change it
Code:
    

    dequeue(circularQueue, buffer);
to something like this

Code:
    

    dequeue(circularQueue, &buffer);
But the file didn't copile then.