• Android version: 9
• Phone model: OnePlus 3T (reported by user - ACRA says unknown)
• Briar version: 1.2.4 (75dfa805)
• User feedback: "Camera error when adding nearby contact. Lineage 16, OnePlus 3T, microG."

Log:

11-21 18:59:15.386 I/CameraView: Opening camera
11-21 18:59:15.391 W/KeyAgreementFragment: org.briarproject.briar.android.keyagreement.CameraException: No camera
org.briarproject.briar.android.keyagreement.CameraException: No camera
        at org.briarproject.briar.android.keyagreement.CameraView.start(CameraView.java:106)
        at org.briarproject.briar.android.keyagreement.KeyAgreementFragment.onStart(KeyAgreementFragment.java:149)
        at android.support.v4.app.Fragment.performStart(Fragment.java:2477)
        at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1494)
        at android.support.v4.app.FragmentManagerImpl.moveFragmentToExpectedState(FragmentManager.java:1784)
        at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1852)
        at android.support.v4.app.BackStackRecord.executeOps(BackStackRecord.java:802)
        at android.support.v4.app.FragmentManagerImpl.executeOps(FragmentManager.java:2625)
        at android.support.v4.app.FragmentManagerImpl.executeOpsTogether(FragmentManager.java:2411)
        at android.support.v4.app.FragmentManagerImpl.removeRedundantOperationsAndExecute(FragmentManager.java:2366)
        at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:2273)
        at android.support.v4.app.FragmentManagerImpl$1.run(FragmentManager.java:733)
        at android.os.Handler.handleCallback(Handler.java:873)
        at android.os.Handler.dispatchMessage(Handler.java:99)
        at android.os.Looper.loop(Looper.java:193)
        at android.app.ActivityThread.main(ActivityThread.java:6718)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)

The phone has front- and back-facing cameras.