• Android version: 8.0.0
• Phone model: Samsung SM-N950U (greatqltesq)
• Briar version: 1.0.9 (841c31eb)
• User feedback: "Couldn't add contact."

Stacktrace:

java.lang.NullPointerException: Attempt to invoke virtual method 'android.view.WindowManager android.app.Activity.getWindowManager()' on a null object reference
        at org.briarproject.briar.android.keyagreement.ShowQrCodeFragment.getScreenRotationDegrees(ShowQrCodeFragment.java:189)
        at org.briarproject.briar.android.keyagreement.ShowQrCodeFragment.reset(ShowQrCodeFragment.java:247)
        at org.briarproject.briar.android.keyagreement.ShowQrCodeFragment.lambda$keyAgreementFailed$5$ShowQrCodeFragment(ShowQrCodeFragment.java:351)
        at org.briarproject.briar.android.keyagreement.ShowQrCodeFragment$$Lambda$5.run(Unknown Source:2)
        at org.briarproject.briar.android.fragment.BaseFragment.lambda$runOnUiThreadUnlessDestroyed$0$BaseFragment(BaseFragment.java:89)
        at org.briarproject.briar.android.fragment.BaseFragment$$Lambda$0.run(Unknown Source:6)
        at android.os.Handler.handleCallback(Handler.java:789)
        at android.os.Handler.dispatchMessage(Handler.java:98)
        at android.os.Looper.loop(Looper.java:164)
        at android.app.ActivityThread.main(ActivityThread.java:6940)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:327)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1374)