Bad Access Exception when printing linked list using templates

As I have just learned templates in C++, I started to practice it. I am at the beginning of the implementation of a Linked List using templates and I have been having an error on Xcode, where it states: "Thread 1: EXC_BAD_ACCESS(code=1, address=0x9)". In my other compiler, it says it is a segmentation fault, but I cannot find the cause of it. What might be the reason of this error?

#include <iostream>

using namespace std;

template <typename T> struct Node{

    T value;
    Node * ptr;
};

template <typename T> class LinkedList {
public:

    LinkedList(const T & element);
    T & push(const T & element);
    T & pop(const int index);
    int get_size() const { return this->_size; }
    void printll();

private:
    LinkedList(){};
    struct Node<T> * head;
    int _size;
};

template <typename T> LinkedList<T>::LinkedList(const T & element){

    struct Node<T> new_node;           
    new_node.value = element;
    new_node.ptr = nullptr;

    this->head = &new_node;            

    this->_size = 1;                    
}

template <typename T> void LinkedList<T>::printll(){

    if(this->head != nullptr){

        Node<T> * temp = this->head;
        while((*temp).ptr != nullptr){  // Error here.
            cout << (*temp).value << " ";
            temp = temp->ptr;
        }
        cout << (*temp).value << endl;
        cout << endl;

    }else {
        cout << "The list is empty!" << endl;
    }
}

int main(int argc, char** argv){

    LinkedList<int> l1(5);

    l1.printll();

    return 0;
}