If it doesn't pass the sniff test, it's not worth further time and thought, and is tossed.
It's rare for it to happen to me, but have tossed hops, dried orange peel, and grain.
The very few times that I overrode my common sense only led to a batch being dumped.
The same goes with anything the wife and I would eat or drink.
Hard lessons learned from experience.
As the old adage goes, when in doubt throw it out.
You should never question something your going to put inside your body.