Program: 180908
Project: 180908
Buggy source:
private void loadEngines(){
  ListPreference enginesPref=(ListPreference)findPreference(KEY_TTS_DEFAULT_SYNTH);
  Intent intent=new Intent("String_Node_Str");
  ResolveInfo[] enginesArray=new ResolveInfo[0];
  PackageManager pm=getPackageManager();
  enginesArray=pm.queryIntentActivities(intent,0).toArray(enginesArray);
  ArrayList<CharSequence> entries=new ArrayList<CharSequence>();
  ArrayList<CharSequence> values=new ArrayList<CharSequence>();
  String enabledEngines="String_Node_Str";
  for (int i=0; i < enginesArray.length; i++) {
    String pluginPackageName=enginesArray[i].activityInfo.packageName;
    if (pluginPackageName.equals(SYSTEM_TTS)) {
      entries.add(enginesArray[i].loadLabel(pm));
      values.add(pluginPackageName);
    }
 else {
      CheckBoxPreference pref=(CheckBoxPreference)findPreference(KEY_PLUGIN_ENABLED_PREFIX + pluginPackageName);
      if ((pref != null) && pref.isChecked()) {
        entries.add(enginesArray[i].loadLabel(pm));
        values.add(pluginPackageName);
        enabledEngines=enabledEngines + pluginPackageName + "String_Node_Str";
      }
    }
  }
  ContentResolver resolver=getContentResolver();
  Settings.Secure.putString(resolver,TTS_ENABLED_PLUGINS,enabledEngines);
  CharSequence entriesArray[]=new CharSequence[entries.size()];
  CharSequence valuesArray[]=new CharSequence[values.size()];
  enginesPref.setEntries(entries.toArray(entriesArray));
  enginesPref.setEntryValues(values.toArray(valuesArray));
}

Fixed version (ground truth):
private void loadEngines(){
  ListPreference enginesPref=(ListPreference)findPreference(KEY_TTS_DEFAULT_SYNTH);
  Intent intent=new Intent("String_Node_Str");
  ResolveInfo[] enginesArray=new ResolveInfo[0];
  PackageManager pm=getPackageManager();
  enginesArray=pm.queryIntentActivities(intent,0).toArray(enginesArray);
  ArrayList<CharSequence> entries=new ArrayList<CharSequence>();
  ArrayList<CharSequence> values=new ArrayList<CharSequence>();
  String enabledEngines="String_Node_Str";
  for (int i=0; i < enginesArray.length; i++) {
    String pluginPackageName=enginesArray[i].activityInfo.packageName;
    if (pluginPackageName.equals(SYSTEM_TTS)) {
      entries.add(enginesArray[i].loadLabel(pm));
      values.add(pluginPackageName);
    }
 else {
      CheckBoxPreference pref=(CheckBoxPreference)findPreference(KEY_PLUGIN_ENABLED_PREFIX + pluginPackageName);
      if ((pref != null) && pref.isChecked()) {
        entries.add(enginesArray[i].loadLabel(pm));
        values.add(pluginPackageName);
        enabledEngines=enabledEngines + pluginPackageName + "String_Node_Str";
      }
    }
  }
  ContentResolver resolver=getContentResolver();
  Settings.Secure.putString(resolver,TTS_ENABLED_PLUGINS,enabledEngines);
  CharSequence entriesArray[]=new CharSequence[entries.size()];
  CharSequence valuesArray[]=new CharSequence[values.size()];
  enginesPref.setEntries(entries.toArray(entriesArray));
  enginesPref.setEntryValues(values.toArray(valuesArray));
  String selectedEngine=Settings.Secure.getString(getContentResolver(),TTS_DEFAULT_SYNTH);
  int selectedEngineIndex=enginesPref.findIndexOfValue(selectedEngine);
  if (selectedEngineIndex == -1) {
    selectedEngineIndex=enginesPref.findIndexOfValue(SYSTEM_TTS);
  }
  enginesPref.setValueIndex(selectedEngineIndex);
}