i have a template matrix it works and every thing but when its finished it stucks at the destructor here is my header

template <class T> class Matrix {  private: string type; int row, col; T **array; void rowShiftDown(const int shiftSize); void colShiftLeft(const int shiftSiz); void Matrix::rowShiftUp(const int   shiftSize); void Matrix::colShiftRight(const int shiftSize);     public: Matrix(int rows, int cols,string matType); // set the (i,j) element to be 'data' void setElement(int i, int j, T data); // return the (i,j) element T getElement(int i, int j); // add 'this' to 'other' and put the result in 'result' void add(Matrix& other, Matrix& result); // rowShift void rowShift(const int shiftSize);  // colShift void colShift(const int shiftSize); // isA matType bool  isA(string matType);  // print the contents of this matrix on the screen. void Matrix::print();  // destroy this matrix ~Matrix();  T* operator [](int i) {     return array[i];}}; 

here is my constructor

Template<class T> Matrix<T>::Matrix(int rows, int cols, string matType) : row(rows), col(cols),type(matType) ,array(new T*[rows]) {//the counstructor if (rows < 0 || cols < 0) {//if the matrix cols and rows were minus then will not do anything     cout << "enter positive valuses only";     return; } //assert(array != NULL); for (int i = 0; i < row; i++) {     array[i] = new T [col];     //assert(array[i] != NULL); } for (int i = 0; i < row; i++)     for (int j = 0; j < col; j++)         array[i][j] = 0;//initilaizing the matrix to zeros 

}

and here is my detructor

template<class T> Matrix <T>::~Matrix() {//destroctur free all the matrix for (int i = 0; i < row; i++) {      delete[]  this->array[i];//this line it does it one time the next iteration it stucks i couldnt figure whats the problem     this->array[i] = NULL;  } delete[]  this->array; this->array = NULL; 

} the problem is at the secound line of the destructor it stucks at the secound iteration like it has nothing to delete there