how to end a loop at a particular time in unordered_multiset

Good morning,

I am trying for a loop when a particular condition is met in an unordered_multiset with the end operation. But it does not work and I get a Segmentation fault in the next iteration of the loop.

Code:

std::unordered_multiset<Element, ElementHash>::iterator itr;
Element elementTemp1("");
for (itr = almacen.begin(); itr != almacen.end(); ++itr) {
    Element tmp(*itr);
    if(tmp.getNombre() == "prueba"){
       itr = almacen.end();
    }
}

How can I solve it? Or maybe my structure is not the right one.