Only exception handling in controller?

This is probably a question that has been done many times, but i find myself doing this some times:

I wonder if it is right to double exception handling where if I create a post in a database from the controller:

try
{
   _postRepository.Create(post);
}
catch (Exception)
{
    throw;
}

But then when I wrote the repository I also wrote an exception handling there. But whose responisbility is this(controller or repository), or should I actually write it both places?