IllegalStateException when hiding UI due to low memory

Android version: 8.1.0
Briar version: 1.1.1 (9476782c)
Phone model: Xiaomi Mi A1 (tissot)
Stacktrace:
java.lang.RuntimeException: Unable to stop activity {org.briarproject.briar.android/org.briarproject.briar.android.logout.HideUiActivity}: java.lang.IllegalStateException: You need to use a Theme.AppCompat theme (or descendant) with this activity.
        at android.app.ActivityThread.performDestroyActivity(ActivityThread.java:4369)
        at android.app.ActivityThread.handleDestroyActivity(ActivityThread.java:4425)
        at android.app.ActivityThread.-wrap5(Unknown Source:0)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1661)
        at android.os.Handler.dispatchMessage(Handler.java:106)
        at android.os.Looper.loop(Looper.java:172)
        at android.app.ActivityThread.main(ActivityThread.java:6590)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807)
Caused by: java.lang.IllegalStateException: You need to use a Theme.AppCompat theme (or descendant) with this activity.
        at android.support.v7.app.AppCompatDelegateImplV9.createSubDecor(AppCompatDelegateImplV9.java:354)
        at android.support.v7.app.AppCompatDelegateImplV9.ensureSubDecor(AppCompatDelegateImplV9.java:323)
        at android.support.v7.app.AppCompatDelegateImplV9.initWindowDecorActionBar(AppCompatDelegateImplV9.java:175)
        at android.support.v7.app.AppCompatDelegateImplBase.getSupportActionBar(AppCompatDelegateImplBase.java:145)
        at android.support.v7.app.AppCompatDelegateImplV9.onStop(AppCompatDelegateImplV9.java:259)
        at android.support.v7.app.AppCompatDelegateImplV14.onStop(AppCompatDelegateImplV14.java:131)
        at android.support.v7.app.AppCompatActivity.onStop(AppCompatActivity.java:184)
        at org.briarproject.briar.android.activity.BaseActivity.onStop(BaseActivity.java:128)
        at android.app.Instrumentation.callActivityOnStop(Instrumentation.java:1376)
        at android.app.Activity.performStop(Activity.java:7205)
        at android.app.ActivityThread.performDestroyActivity(ActivityThread.java:4364)
        ... 9 more
java.lang.IllegalStateException: You need to use a Theme.AppCompat theme (or descendant) with this activity.
        at android.support.v7.app.AppCompatDelegateImplV9.createSubDecor(AppCompatDelegateImplV9.java:354)
        at android.support.v7.app.AppCompatDelegateImplV9.ensureSubDecor(AppCompatDelegateImplV9.java:323)
        at android.support.v7.app.AppCompatDelegateImplV9.initWindowDecorActionBar(AppCompatDelegateImplV9.java:175)
        at android.support.v7.app.AppCompatDelegateImplBase.getSupportActionBar(AppCompatDelegateImplBase.java:145)
        at android.support.v7.app.AppCompatDelegateImplV9.onStop(AppCompatDelegateImplV9.java:259)
        at android.support.v7.app.AppCompatDelegateImplV14.onStop(AppCompatDelegateImplV14.java:131)
        at android.support.v7.app.AppCompatActivity.onStop(AppCompatActivity.java:184)
        at org.briarproject.briar.android.activity.BaseActivity.onStop(BaseActivity.java:128)
        at android.app.Instrumentation.callActivityOnStop(Instrumentation.java:1376)
        at android.app.Activity.performStop(Activity.java:7205)
        at android.app.ActivityThread.performDestroyActivity(ActivityThread.java:4364)
        at android.app.ActivityThread.handleDestroyActivity(ActivityThread.java:4425)
        at android.app.ActivityThread.-wrap5(Unknown Source:0)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1661)
        at android.os.Handler.dispatchMessage(Handler.java:106)
        at android.os.Looper.loop(Looper.java:172)
        at android.app.ActivityThread.main(ActivityThread.java:6590)
        at java.lang.reflect.Method.invoke(Native Method)
        at android.app.ActivityThread.-wrap5(Unknown Source:0)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1661)
        at android.os.Handler.dispatchMessage(Handler.java:106)
        at android.os.Looper.loop(Looper.java:172)
        at android.app.ActivityThread.main(ActivityThread.java:6590)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807)
Caused by: java.lang.IllegalStateException: You need to use a Theme.AppCompat theme (or descendant) with this activity.
        at android.support.v7.app.AppCompatDelegateImplV9.createSubDecor(AppCompatDelegateImplV9.java:354)
        at android.support.v7.app.AppCompatDelegateImplV9.ensureSubDecor(AppCompatDelegateImplV9.java:323)
        at android.support.v7.app.AppCompatDelegateImplV9.initWindowDecorActionBar(AppCompatDelegateImplV9.java:175)
        at android.support.v7.app.AppCompatDelegateImplBase.getSupportActionBar(AppCompatDelegateImplBase.java:145)
        at android.support.v7.app.AppCompatDelegateImplV9.onStop(AppCompatDelegateImplV9.java:259)
        at android.support.v7.app.AppCompatDelegateImplV14.onStop(AppCompatDelegateImplV14.java:131)
        at android.support.v7.app.AppCompatActivity.onStop(AppCompatActivity.java:184)
        at org.briarproject.briar.android.activity.BaseActivity.onStop(BaseActivity.java:128)
        at android.app.Instrumentation.callActivityOnStop(Instrumentation.java:1376)
        at android.app.Activity.performStop(Activity.java:7205)
        at android.app.ActivityThread.performDestroyActivity(ActivityThread.java:4364)
        ... 9 more
java.lang.IllegalStateException: You need to use a Theme.AppCompat theme (or descendant) with this activity.
        at android.support.v7.app.AppCompatDelegateImplV9.createSubDecor(AppCompatDelegateImplV9.java:354)
        at android.support.v7.app.AppCompatDelegateImplV9.ensureSubDecor(AppCompatDelegateImplV9.java:323)
        at android.support.v7.app.AppCompatDelegateImplV9.initWindowDecorActionBar(AppCompatDelegateImplV9.java:175)
        at android.support.v7.app.AppCompatDelegateImplBase.getSupportActionBar(AppCompatDelegateImplBase.java:145)
        at android.support.v7.app.AppCompatDelegateImplV9.onStop(AppCompatDelegateImplV9.java:259)
        at android.support.v7.app.AppCompatDelegateImplV14.onStop(AppCompatDelegateImplV14.java:131)
        at android.support.v7.app.AppCompatActivity.onStop(AppCompatActivity.java:184)
        at org.briarproject.briar.android.activity.BaseActivity.onStop(BaseActivity.java:128)
        at android.app.Instrumentation.callActivityOnStop(Instrumentation.java:1376)
        at android.app.Activity.performStop(Activity.java:7205)
        at android.app.ActivityThread.performDestroyActivity(ActivityThread.java:4364)
        at android.app.ActivityThread.handleDestroyActivity(ActivityThread.java:4425)
        at android.app.ActivityThread.-wrap5(Unknown Source:0)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1661)
        at android.os.Handler.dispatchMessage(Handler.java:106)
        at android.os.Looper.loop(Looper.java:172)
        at android.app.ActivityThread.main(ActivityThread.java:6590)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807)
Edited Oct 02, 2018 by akwizgran