NPE when stopping KeyAgreementTask
This comes from the attached crash report:
10-01 13:32:55.236 E/ACRA (12071): ACRA caught a NullPointerException for org.briarproject.unofficial
10-01 13:32:55.236 E/ACRA (12071): java.lang.NullPointerException: Attempt to invoke interface method 'void org.briarproject.api.keyagreement.KeyAgreementTask.stopListening()' on a null object reference
10-01 13:32:55.236 E/ACRA (12071): at org.briarproject.android.keyagreement.ShowQrCodeFragment$3.run(ShowQrCodeFragment.java:192)
The user has customised the package name and version number, so there may be other modifications.