How to Remove external detector - scrubadub_stanford.detectors.StanfordEntityDetector

I keep getting error when try to add External detector - 'StanfordEntityDetector',

KeyError: 'can not add Detector "stanford" to this Scrubber, this name is already in use. Try removing it first.'


I tried removing it,
scrubber.remove_detector(scrubadub_stanford.detectors.StanfordEntityDetector)
scrubber.remove_detector('stanford')

But nothing works.