E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.github.shadowsocks, PID: 10599
    java.lang.RuntimeException: Unable to destroy activity {com.github.shadowsocks/com.github.shadowsocks.ScannerActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.Thread$State java.lang.Thread.getState()' on a null object reference
        at android.app.ActivityThread.performDestroyActivity(ActivityThread.java:5012)
        at android.app.ActivityThread.handleDestroyActivity(ActivityThread.java:5041)
        at android.app.servertransaction.DestroyActivityItem.execute(DestroyActivityItem.java:44)
        at android.app.servertransaction.TransactionExecutor.executeLifecycleState(TransactionExecutor.java:176)
        at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:97)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2049)
        at android.os.Handler.dispatchMessage(Handler.java:106)
        at android.os.Looper.loop(Looper.java:223)
        at android.app.ActivityThread.main(ActivityThread.java:7523)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:592)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:941)
     Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.Thread$State java.lang.Thread.getState()' on a null object reference
        at com.google.android.gms.samples.vision.barcodereader.ui.camera.CameraSource$FrameProcessingRunnable.release(CameraSource.java:1117)
        at com.google.android.gms.samples.vision.barcodereader.ui.camera.CameraSource.release(CameraSource.java:327)
        at com.google.android.gms.samples.vision.barcodereader.ui.camera.CameraSourcePreview.release(CameraSourcePreview.java:84)
        at com.google.android.gms.samples.vision.barcodereader.BarcodeCapture.onDestroy(BarcodeCapture.java:308)
        at androidx.fragment.app.Fragment.performDestroy(Fragment.java:2928)
        at androidx.fragment.app.FragmentStateManager.destroy(FragmentStateManager.java:492)
        at androidx.fragment.app.FragmentManager.moveToState(FragmentManager.java:1308)
        at androidx.fragment.app.FragmentManager.moveToState(FragmentManager.java:1368)
        at androidx.fragment.app.FragmentManager.moveFragmentToExpectedState(FragmentManager.java:1446)
        at androidx.fragment.app.FragmentManager.moveToState(FragmentManager.java:1509)
        at androidx.fragment.app.FragmentManager.dispatchStateChange(FragmentManager.java:2637)
        at androidx.fragment.app.FragmentManager.dispatchDestroy(FragmentManager.java:2621)
        at androidx.fragment.app.FragmentController.dispatchDestroy(FragmentController.java:330)
        at androidx.fragment.app.FragmentActivity.onDestroy(FragmentActivity.java:365)
        at androidx.appcompat.app.AppCompatActivity.onDestroy(AppCompatActivity.java:233)
        at android.app.Activity.performDestroy(Activity.java:8229)
        at android.app.Instrumentation.callActivityOnDestroy(Instrumentation.java:1344)
        at android.app.ActivityThread.performDestroyActivity(ActivityThread.java:4997)
        at android.app.ActivityThread.handleDestroyActivity(ActivityThread.java:5041) 
        at android.app.servertransaction.DestroyActivityItem.execute(DestroyActivityItem.java:44) 
        at android.app.servertransaction.TransactionExecutor.executeLifecycleState(TransactionExecutor.java:176) 
        at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:97) 
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2049) 
        at android.os.Handler.dispatchMessage(Handler.java:106) 
        at android.os.Looper.loop(Looper.java:223) 
        at android.app.ActivityThread.main(ActivityThread.java:7523) 
        at java.lang.reflect.Method.invoke(Native Method) 
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:592) 
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:941)