Program: 8211
Project: 8211
Buggy source:
@Override public void onSharedPreferenceChanged(SharedPreferences sharedPreferences,String key){
  if (Pref.KEY_SERVERS.equals(key)) {
    Timber.d("String_Node_Str",key);
    String keyServers=sharedPreferences.getString(Pref.KEY_SERVERS,Defaults.KEY_SERVERS);
    String current=keyServers.substring(keyServers.indexOf(','));
    String coarseGranularityKeyserver;
    if (current.contains("String_Node_Str")) {
      coarseGranularityKeyserver="String_Node_Str";
    }
 else     if (current.contains("String_Node_Str")) {
      coarseGranularityKeyserver="String_Node_Str";
    }
 else     if (current.contains("String_Node_Str")) {
      coarseGranularityKeyserver="String_Node_Str";
    }
 else {
      coarseGranularityKeyserver="String_Node_Str";
    }
    TrackHelper.track().interaction("String_Node_Str" + Pref.KEY_SERVERS,coarseGranularityKeyserver).with(piwikTracker);
    return;
  }
  if (Pref.THEME.equals(key)) {
    String value=sharedPreferences.getString(key,"String_Node_Str");
    TrackHelper.track().interaction("String_Node_Str" + key,value).with(piwikTracker);
    return;
  }
  if (Pref.ANALYTICS_PREFS.contains(key)) {
    Timber.d("String_Node_Str",key);
    if (!sharedPreferences.contains(key)) {
      TrackHelper.track().interaction("String_Node_Str" + key,"String_Node_Str").with(piwikTracker);
      return;
    }
    boolean value=sharedPreferences.getBoolean(key,false);
    TrackHelper.track().interaction("String_Node_Str" + key,value ? "String_Node_Str" : "String_Node_Str").with(piwikTracker);
  }
}

Fixed version (ground truth):
@Override public void onSharedPreferenceChanged(SharedPreferences sharedPreferences,String key){
  if (piwikTracker == null) {
    return;
  }
  if (Pref.KEY_SERVERS.equals(key)) {
    Timber.d("String_Node_Str",key);
    String keyServers=sharedPreferences.getString(Pref.KEY_SERVERS,Defaults.KEY_SERVERS);
    String current=keyServers.substring(keyServers.indexOf(','));
    String coarseGranularityKeyserver;
    if (current.contains("String_Node_Str")) {
      coarseGranularityKeyserver="String_Node_Str";
    }
 else     if (current.contains("String_Node_Str")) {
      coarseGranularityKeyserver="String_Node_Str";
    }
 else     if (current.contains("String_Node_Str")) {
      coarseGranularityKeyserver="String_Node_Str";
    }
 else {
      coarseGranularityKeyserver="String_Node_Str";
    }
    TrackHelper.track().interaction("String_Node_Str" + Pref.KEY_SERVERS,coarseGranularityKeyserver).with(piwikTracker);
    return;
  }
  if (Pref.THEME.equals(key)) {
    String value=sharedPreferences.getString(Pref.THEME,"String_Node_Str");
    TrackHelper.track().interaction("String_Node_Str" + Pref.THEME,value).with(piwikTracker);
    return;
  }
  if (Pref.ANALYTICS_PREFS.contains(key)) {
    Timber.d("String_Node_Str",key);
    if (!sharedPreferences.contains(key)) {
      TrackHelper.track().interaction("String_Node_Str" + key,"String_Node_Str").with(piwikTracker);
      return;
    }
    boolean value=sharedPreferences.getBoolean(key,false);
    TrackHelper.track().interaction("String_Node_Str" + key,value ? "String_Node_Str" : "String_Node_Str").with(piwikTracker);
  }
}