09-03 07:22:20.628  19731-19731/? E/AndroidRuntime﹕ FATAL EXCEPTION: main
    Process: com.backdrops.walls, PID: 19731
    java.lang.IllegalStateException: Can not perform this action after onSaveInstanceState
            at android.support.v4.app.FragmentManagerImpl.checkStateLoss(FragmentManager.java:1438)
            at android.support.v4.app.FragmentManagerImpl.popBackStackImmediate(FragmentManager.java:549)
            at android.support.v4.app.FragmentActivity.onBackPressed(FragmentActivity.java:166)
            at com.backdrops.walls.detail.WallpaperDetailActivity.access$601(WallpaperDetailActivity.java:87)
            at com.backdrops.walls.detail.WallpaperDetailActivity$7.returnToMenu(WallpaperDetailActivity.java:342)
            at com.backdrops.walls.detail.WallpaperDetailActivity$7.run(WallpaperDetailActivity.java:337)
            at android.os.Handler.handleCallback(Handler.java:739)
            at android.os.Handler.dispatchMessage(Handler.java:95)
            at android.os.Looper.loop(Looper.java:145)
            at android.app.ActivityThread.main(ActivityThread.java:6891)
            at java.lang.reflect.Method.invoke(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:372)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1404)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1199)