java.lang.NullPointerException: Attempt to invoke virtual method 'android.app.ActivityThread$ApplicationThread android.app.ActivityThread.getApplicationThread()' on a null object reference

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Attempt to invoke virtual method 'android.app.ActivityThread$ApplicationThread android.app.ActivityThread.getApplicationThread()' on a null object reference
java.lang.NullPointerException: Attempt to invoke virtual method 'android.app.ActivityThread$ApplicationThread android.app.ActivityThread.getApplicationThread()' on a null object reference	at android.app.Activity.startActivityForResult(Activity.java:4283)	at android.app.Activity.startActivityForResult(Activity.java:4230)	at android.app.Activity.startActivity(Activity.java:4567)	at android.app.Activity.startActivity(Activity.java:4535)	at appinventor.ai_itiel_maimon.Rubiks_cube.SettingsActivity.restartApp(SettingsActivity.java:59)	at appinventor.ai_itiel_maimon.Rubiks_cube.SettingsActivity.access$000(SettingsActivity.java:16)	at appinventor.ai_itiel_maimon.Rubiks_cube.SettingsActivity$2.onPreferenceChange(SettingsActivity.java:50)	at android.preference.Preference.callChangeListener(Preference.java:1173)	at android.preference.ListPreference.onDialogClosed(ListPreference.java:282)	at android.preference.DialogPreference.onDismiss(DialogPreference.java:424)	at android.app.Dialog$ListenersHandler.handleMessage(Dialog.java:1533)	at android.os.Handler.dispatchMessage(Handler.java:102)	at android.os.Looper.loop(Looper.java:158)	at android.app.ActivityThread.main(ActivityThread.java:7229)	at java.lang.reflect.Method.invoke(Native Method)	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230)	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)