c++ - Double free or corruption when using destructor

In the following code when I add the the line which is specified with an arrow gives error:

Error in `./a.out': double free or corruption (fasttop):
0x00000000007a7030 * Aborted (core dumped)

The code works if I do not use destructor. Any idea?

#include
#include

struct Element
{
    int *vtx;

    ~Element ()
    {
        delete [] vtx;

    }
};

int main ()
{
    Element *elm = new Element [2];
    elm[0].vtx = new int [2]; // <----- adding this gives error

    std::vector  vec;
    vec.push_back (elm[0]);

    vec.push_back (elm[0]);

    return 0;
}