Program: 20784
Project: 20784
Buggy source:
@Override public void handleFree(DownloadLink downloadLink) throws Exception, PluginException {
  requestFileInformation(downloadLink);
  if (br.containsHTML("String_Node_Str")) {
    String wait=br.getRegex("String_Node_Str").getMatch(0);
    if (wait == null)     wait=br.getRegex("String_Node_Str").getMatch(0);
    if (wait != null)     throw new PluginException(LinkStatus.ERROR_IP_BLOCKED,Integer.parseInt(wait) * 1001l);
 else     throw new PluginException(LinkStatus.ERROR_IP_BLOCKED);
  }
  String fileID=new Regex(downloadLink.getDownloadURL(),"String_Node_Str").getMatch(0);
  String tempID=br.getRegex("String_Node_Str").getMatch(0);
  if (fileID == null || tempID == null)   throw new PluginException(LinkStatus.ERROR_PLUGIN_DEFECT);
  br.getHeaders().put("String_Node_Str","String_Node_Str");
  br.postPage("String_Node_Str" + fileID + "String_Node_Str","String_Node_Str" + tempID);
  String rgexedWait=br.getRegex("String_Node_Str").getMatch(0);
  int wait=45;
  if (rgexedWait != null) {
    wait=Integer.parseInt(rgexedWait);
    logger.info("String_Node_Str" + wait);
  }
  wait+=3;
  sleep(wait * 1001l,downloadLink);
  br.postPage("String_Node_Str" + fileID + "String_Node_Str","String_Node_Str" + tempID);
  String dllink=br.getRegex("String_Node_Str").getMatch(0);
  if (dllink == null) {
    logger.warning("String_Node_Str");
    throw new PluginException(LinkStatus.ERROR_PLUGIN_DEFECT);
  }
  dl=jd.plugins.BrowserAdapter.openDownload(br,downloadLink,dllink,true,1);
  if (dl.getConnection().getContentType().contains("String_Node_Str")) {
    br.followConnection();
    if (br.containsHTML("String_Node_Str"))     throw new PluginException(LinkStatus.ERROR_TEMPORARILY_UNAVAILABLE,"String_Node_Str");
    throw new PluginException(LinkStatus.ERROR_PLUGIN_DEFECT);
  }
  dl.startDownload();
}

Fixed version (ground truth):
@Override public void handleFree(DownloadLink downloadLink) throws Exception, PluginException {
  requestFileInformation(downloadLink);
  if (br.containsHTML("String_Node_Str")) {
    String wait=br.getRegex("String_Node_Str").getMatch(0);
    if (wait == null)     wait=br.getRegex("String_Node_Str").getMatch(0);
    if (wait != null)     throw new PluginException(LinkStatus.ERROR_IP_BLOCKED,Integer.parseInt(wait) * 1001l);
 else     throw new PluginException(LinkStatus.ERROR_IP_BLOCKED);
  }
  String fileID=new Regex(downloadLink.getDownloadURL(),"String_Node_Str").getMatch(0);
  String tempID=br.getRegex("String_Node_Str").getMatch(0);
  if (fileID == null || tempID == null)   throw new PluginException(LinkStatus.ERROR_PLUGIN_DEFECT);
  br.getHeaders().put("String_Node_Str","String_Node_Str");
  br.postPage("String_Node_Str" + fileID + "String_Node_Str","String_Node_Str" + tempID);
  String rgexedWait=br.getRegex("String_Node_Str").getMatch(0);
  int wait=45;
  if (rgexedWait != null) {
    wait=Integer.parseInt(rgexedWait);
    logger.info("String_Node_Str" + wait);
  }
  wait+=3;
  sleep(wait * 1001l,downloadLink);
  br.postPage("String_Node_Str" + fileID + "String_Node_Str","String_Node_Str" + tempID);
  String dllink=br.getRegex("String_Node_Str").getMatch(0);
  if (dllink == null) {
    logger.warning("String_Node_Str");
    throw new PluginException(LinkStatus.ERROR_PLUGIN_DEFECT);
  }
  dllink=dllink.replace("String_Node_Str","String_Node_Str");
  logger.info("String_Node_Str");
  dl=jd.plugins.BrowserAdapter.openDownload(br,downloadLink,dllink,true,1);
  if (dl.getConnection().getContentType().contains("String_Node_Str")) {
    br.followConnection();
    if (br.containsHTML("String_Node_Str"))     throw new PluginException(LinkStatus.ERROR_TEMPORARILY_UNAVAILABLE,"String_Node_Str");
    throw new PluginException(LinkStatus.ERROR_PLUGIN_DEFECT);
  }
  dl.startDownload();
}