R.D.
Try running it empty, but first, toss a cup of white vinegar in there. You might need to cycle it twice to get the stink out. If that doesn't work, since I don't know what kind you have, there are some models that have actual filters which are a HUGE pain in the butt to change and you'll have to call someone to do it (my husband has to do this for college kids who live in the buildings he works for, and often, because they don't pre rinse anything!)
But try the vinegar, that almost always works.