Program: 20988
Project: 20988
Buggy source:
public ArrayList<DownloadLink> decryptIt(CryptedLink param,ProgressController progress) throws Exception {
  ArrayList<DownloadLink> decryptedLinks=new ArrayList<DownloadLink>();
  ArrayList<String> linksList=new ArrayList<String>();
  String parameter=param.toString();
  br.setFollowRedirects(false);
  br.getPage(parameter);
  if (br.containsHTML("String_Node_Str")) {
    logger.warning("String_Node_Str");
    logger.warning(JDL.L("String_Node_Str","String_Node_Str"));
    return new ArrayList<DownloadLink>();
  }
  if (parameter.contains("String_Node_Str")) {
    String b64=br.getRegex("String_Node_Str").getMatch(0);
    if (b64 == null)     throw new PluginException(LinkStatus.ERROR_PLUGIN_DEFEKT);
    b64=Encoding.Base64Decode(b64);
    String finallink=new Regex(b64,"String_Node_Str").getMatch(0);
    if (finallink == null)     throw new PluginException(LinkStatus.ERROR_PLUGIN_DEFEKT);
    DownloadLink dl=createDownloadlink(finallink);
    decryptedLinks.add(dl);
    return decryptedLinks;
  }
  if (br.containsHTML("String_Node_Str")) {
    for (int i=0; i <= 1; i++) {
      Form captchaForm=br.getFormbyKey("String_Node_Str");
      if (captchaForm == null)       throw new PluginException(LinkStatus.ERROR_PLUGIN_DEFEKT);
      String code=br.getRegex("String_Node_Str").getMatch(0);
      if (code == null)       throw new PluginException(LinkStatus.ERROR_PLUGIN_DEFEKT);
      captchaForm.put("String_Node_Str",code);
      br.submitForm(captchaForm);
      if (br.containsHTML("String_Node_Str"))       continue;
      break;
    }
  }
  if (br.containsHTML("String_Node_Str"))   throw new DecrypterException(DecrypterException.CAPTCHA);
  String[] pageLinks=br.getRegex("String_Node_Str").getColumn(0);
  for (int i=1; i < pageLinks.length; i++) {
    String[] links=br.getRegex("String_Node_Str").getColumn(0);
    if (links == null || links.length == 0)     return null;
    for (    String link : links) {
      linksList.add(link);
    }
    br.getPage(pageLinks[i].replace("String_Node_Str","String_Node_Str"));
  }
  progress.setRange(linksList.size());
  for (  String link : linksList) {
    br.getPage(link);
    String b64=br.getRegex("String_Node_Str").getMatch(0);
    if (b64 == null)     throw new PluginException(LinkStatus.ERROR_PLUGIN_DEFEKT);
    b64=Encoding.Base64Decode(b64);
    String finallink=new Regex(b64,"String_Node_Str").getMatch(0);
    if (finallink == null)     throw new PluginException(LinkStatus.ERROR_PLUGIN_DEFEKT);
    DownloadLink dl=createDownloadlink(finallink);
    decryptedLinks.add(dl);
    progress.increase(1);
  }
  return decryptedLinks;
}

Fixed version (ground truth):
public ArrayList<DownloadLink> decryptIt(CryptedLink param,ProgressController progress) throws Exception {
  ArrayList<DownloadLink> decryptedLinks=new ArrayList<DownloadLink>();
  ArrayList<String> linksList=new ArrayList<String>();
  String parameter=param.toString();
  br.setFollowRedirects(false);
  br.getPage(parameter);
  if (br.containsHTML("String_Node_Str")) {
    logger.warning("String_Node_Str");
    logger.warning(JDL.L("String_Node_Str","String_Node_Str"));
    return new ArrayList<DownloadLink>();
  }
  if (parameter.contains("String_Node_Str")) {
    String b64=br.getRegex("String_Node_Str").getMatch(0);
    if (b64 == null)     throw new PluginException(LinkStatus.ERROR_PLUGIN_DEFEKT);
    b64=Encoding.Base64Decode(b64);
    String finallink=new Regex(b64,"String_Node_Str").getMatch(0);
    if (finallink == null)     throw new PluginException(LinkStatus.ERROR_PLUGIN_DEFEKT);
    DownloadLink dl=createDownloadlink(finallink);
    decryptedLinks.add(dl);
    return decryptedLinks;
  }
  if (br.containsHTML("String_Node_Str")) {
    for (int i=0; i <= 1; i++) {
      Form captchaForm=br.getFormbyKey("String_Node_Str");
      if (captchaForm == null)       throw new PluginException(LinkStatus.ERROR_PLUGIN_DEFEKT);
      String code=br.getRegex("String_Node_Str").getMatch(0);
      if (code == null)       throw new PluginException(LinkStatus.ERROR_PLUGIN_DEFEKT);
      captchaForm.put("String_Node_Str",code);
      br.submitForm(captchaForm);
      if (br.containsHTML("String_Node_Str"))       continue;
      break;
    }
  }
  if (br.containsHTML("String_Node_Str"))   throw new DecrypterException(DecrypterException.CAPTCHA);
  System.out.println("String_Node_Str" + br.toString());
  String[] pageLinks=br.getRegex("String_Node_Str").getColumn(0);
  for (int i=0; i < pageLinks.length; i++) {
    br.getPage(pageLinks[i].replace("String_Node_Str","String_Node_Str"));
    String[] links=br.getRegex("String_Node_Str").getColumn(0);
    if (links == null || links.length == 0)     return null;
    for (    String link : links) {
      linksList.add(link);
    }
  }
  progress.setRange(linksList.size());
  for (  String link : linksList) {
    br.getPage(link);
    String b64=br.getRegex("String_Node_Str").getMatch(0);
    if (b64 == null)     throw new PluginException(LinkStatus.ERROR_PLUGIN_DEFEKT);
    b64=Encoding.Base64Decode(b64);
    String finallink=new Regex(b64,"String_Node_Str").getMatch(0);
    if (finallink == null)     throw new PluginException(LinkStatus.ERROR_PLUGIN_DEFEKT);
    DownloadLink dl=createDownloadlink(finallink);
    decryptedLinks.add(dl);
    progress.increase(1);
  }
  return decryptedLinks;
}