Run-time error

#include <iostream>//Defolt input/output
#include <iomanip> //For input/output manipulators
#include <stdlib.h>//For function rand() and srand()
#include <time.h>//For time()
#include <conio.h>// For getch()
using namespace std;
/*Global matrix size*/
const int x = 3, y = 4;
 
void procces_pointer_matrix(int **matr)
{
  cout << "\n\n";
  cout << " Matrix:\n\n";
  /*Fill and display matrix from diapzaon [0;9]*/
  for(int i = 0; i < x; ++i)
  {
    for(int j = 0; j < y; ++j)
    {
      *(*(matr + j) + i) = rand() % 10;
      cout << setw(3) << *(*(matr + j) + i) << ' ';
    }
    cout << '\n';
  }
 
  int arr_sum[x];
  for(int i = 0; i < x; ++i)
  {
    *(arr_sum + i) = 0;
    for(int j = 0; j < y; ++j)
      *(arr_sum + i) += *(*(matr + j) + i);
    cout << "\nSum elemetns " << (i + 1) << " row = " << *(arr_sum + i);
  }
 
  int max = arr_sum[0];
  for(int i = 0; i < x; ++i)
    if(arr_sum[i] > max)
      max = arr_sum[i];
 
  cout << "\n\nMax sum = " << max << endl;
}
 
int main()
{
  int **matr = new int*[x];
  for(int k = 0; k < x; ++k)
    matr[k] = new int[y];
  srand(time(0));
  procces_pointer_matrix(matr);
  for(int k = 0; k < x; ++k)
    delete[] matr[k];
  delete[] matr;
  getch();
  return 0;
}

*(*(matr + j) + i)

*(*(matr + i) +j)