diff --git a/app/src/main/java/info/nightscout/androidaps/activities/PreferencesActivity.java b/app/src/main/java/info/nightscout/androidaps/activities/PreferencesActivity.java
index 328f143836..96a2b23b06 100644
--- a/app/src/main/java/info/nightscout/androidaps/activities/PreferencesActivity.java
+++ b/app/src/main/java/info/nightscout/androidaps/activities/PreferencesActivity.java
@@ -68,6 +68,12 @@ public class PreferencesActivity extends PreferenceActivity implements SharedPre
         PreferenceManager.getDefaultSharedPreferences(this).registerOnSharedPreferenceChangeListener(this);
     }
 
+    @Override
+    protected void onDestroy() {
+        super.onDestroy();
+        PreferenceManager.getDefaultSharedPreferences(this).unregisterOnSharedPreferenceChangeListener(this);
+    }
+
     @Override
     public void attachBaseContext(Context newBase) {
         super.attachBaseContext(LocaleHelper.INSTANCE.wrap(newBase));