Can't you just rack the heavier bar and rep out with some lighter weights instead?
Training is all about thinking outside the box... If you have a spotter, use forced reps - if you don't have a spotter, do a drop set, or rest-pause set.
Remember: failure with a selected weight, doesn't mean muscle failuire.
In layman's terms: just because you can't do another rep at 'x' weight, doesn't mean you can't drop to 'y' weight and crank out a few more.