dialog disappears after rotation

[anlalalu]

Reproduction Steps

1. tap 'SIM CARD'
2. tap 'delete' and a dialog appears
3. rotate the screen

Expected Result

The dialog still exists with no error log.

Actual Result

The dialog disappears with the stack trace:

E/WindowManager: android.view.WindowLeaked: Activity com.github.yeriomin.dumbphoneassistant.ManageContactsActivity has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView{529ee3c4 V.E..... R....... 0,0-729,242} that was originally added here
at android.view.ViewRootImpl.(ViewRootImpl.java:346)
at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:248)
at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:69)
at android.app.Dialog.show(Dialog.java:286)
at android.app.AlertDialog$Builder.show(AlertDialog.java:951)
at com.github.yeriomin.dumbphoneassistant.ManageContactsActivity$3.onClick(ManageContactsActivity.java:175)
at android.view.View.performClick(View.java:4438)
at android.view.View$PerformClick.run(View.java:18422)
at android.os.Handler.handleCallback(Handler.java:733)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5001)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)
at dalvik.system.NativeStart.main(Native Method)

Debug info

App Version = 0.5

Android Version = 4.4.4

[anlalalu]

Maybe solved with reference to this: https://stackoverflow.com/questions/2850573/activity-has-leaked-window-that-was-originally-added

If you do consider this as a defect, please let me know. Thank you.