Crash: 'service discovery not active on listener'

[wilsonpage]

java.lang.IllegalArgumentException: service discovery not active on listener
at android.net.nsd.NsdManager.stopServiceDiscovery(NsdManager.java:584)
at org.mozilla.magnet.scanner.mdns.ScannerMdns.onStartDiscoveryFailed(ScannerMdns.java:75)
at android.net.nsd.NsdManager$ServiceHandler.handleMessage(NsdManager.java:329)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.os.HandlerThread.run(HandlerThread.java:61)