Program: 20956
Project: 20956
Buggy source:
public void handleWebsiteDownload(DownloadLink link,Account account) throws Exception {
  if (account != null) {
    login(account,true);
  }
  int captchTries=10;
  Form form=null;
  String code=null;
  while (captchTries-- >= 0) {
    br.getPage("String_Node_Str" + wwwWorkaround + "String_Node_Str"+ getDownloadID(link));
    String red=br.getRegex("String_Node_Str").getMatch(0);
    if (red != null) {
      logger.severe("String_Node_Str");
      br.getPage(red);
      String wait=br.getRegex("String_Node_Str").getMatch(0);
      int l=30;
      if (wait != null) {
        l=Integer.parseInt(wait.trim());
      }
      limitReached(link,l * 60,"String_Node_Str");
    }
    if (br.containsHTML("String_Node_Str"))     throw new PluginException(LinkStatus.ERROR_FATAL,"String_Node_Str");
    form=br.getForm(0);
    if (form != null && form.containsHTML("String_Node_Str"))     form=br.getForm(1);
    if (form != null && form.containsHTML("String_Node_Str")) {
      String passCode;
      if (link.getStringProperty("String_Node_Str",null) == null) {
        passCode=Plugin.getUserInput("String_Node_Str",link);
      }
 else {
        passCode=link.getStringProperty("String_Node_Str",null);
      }
      form.put("String_Node_Str",passCode);
      br.submitForm(form);
      form=br.getForm(0);
      if (form != null && form.containsHTML("String_Node_Str"))       form=br.getForm(1);
      if (form != null && form.containsHTML("String_Node_Str")) {
        link.setProperty("String_Node_Str",null);
        throw new PluginException(LinkStatus.ERROR_FATAL,JDL.L("String_Node_Str","String_Node_Str"));
      }
 else {
        link.setProperty("String_Node_Str",passCode);
      }
    }
    if (form != null && form.containsHTML("String_Node_Str")) {
      String captcha=form.getRegex("String_Node_Str").getMatch(0);
      File file=this.getLocalCaptchaFile();
      Browser c=br.cloneBrowser();
      c.getHeaders().put("String_Node_Str","String_Node_Str");
      URLConnectionAdapter con=c.openGetConnection(captcha);
      Browser.download(file,con);
      code=getCaptchaCode(file,link);
      if (code == null)       continue;
      form.put("String_Node_Str",code);
      br.submitForm(form);
      form=br.getForm(0);
      if (form != null && form.containsHTML("String_Node_Str"))       form=br.getForm(1);
      if (form != null && form.containsHTML("String_Node_Str")) {
        continue;
      }
 else {
        break;
      }
    }
  }
  if (form != null && form.containsHTML("String_Node_Str"))   throw new PluginException(LinkStatus.ERROR_CAPTCHA);
  String url=br.getRegex("String_Node_Str").getMatch(0);
  doDownload(link,url,true,account);
}

Fixed version (ground truth):
public void handleWebsiteDownload(DownloadLink link,Account account) throws Exception {
  if (account != null) {
    login(account,true);
  }
  int captchTries=10;
  Form form=null;
  String code=null;
  while (captchTries-- >= 0) {
    br.getPage("String_Node_Str" + wwwWorkaround + "String_Node_Str"+ getDownloadID(link));
    String red=br.getRegex("String_Node_Str").getMatch(0);
    if (red != null) {
      logger.severe("String_Node_Str");
      br.getPage(red);
      String wait=br.getRegex("String_Node_Str").getMatch(0);
      int l=30;
      if (wait != null) {
        l=Integer.parseInt(wait.trim());
      }
      limitReached(link,l * 60,"String_Node_Str");
    }
    if (br.containsHTML("String_Node_Str"))     throw new PluginException(LinkStatus.ERROR_FATAL,"String_Node_Str");
    form=br.getForm(0);
    if (form != null && form.containsHTML("String_Node_Str"))     form=br.getForm(1);
    if (form != null && form.containsHTML("String_Node_Str")) {
      String passCode;
      if (link.getStringProperty("String_Node_Str",null) == null) {
        passCode=Plugin.getUserInput("String_Node_Str",link);
      }
 else {
        passCode=link.getStringProperty("String_Node_Str",null);
      }
      form.put("String_Node_Str",passCode);
      br.submitForm(form);
      form=br.getForm(0);
      if (form != null && form.containsHTML("String_Node_Str"))       form=br.getForm(1);
      if (form != null && form.containsHTML("String_Node_Str")) {
        link.setProperty("String_Node_Str",null);
        throw new PluginException(LinkStatus.ERROR_FATAL,JDL.L("String_Node_Str","String_Node_Str"));
      }
 else {
        link.setProperty("String_Node_Str",passCode);
      }
    }
    if (form != null && form.containsHTML("String_Node_Str")) {
      String captcha=form.getRegex("String_Node_Str").getMatch(0);
      File file=this.getLocalCaptchaFile();
      Browser c=br.cloneBrowser();
      c.getHeaders().put("String_Node_Str","String_Node_Str");
      URLConnectionAdapter con=c.openGetConnection(captcha);
      Browser.download(file,con);
      code=getCaptchaCode(file,link);
      if (code == null)       continue;
      form.put("String_Node_Str",code);
      br.submitForm(form);
      form=br.getForm(0);
      if (form != null && form.containsHTML("String_Node_Str"))       form=br.getForm(1);
      if (form != null && form.containsHTML("String_Node_Str")) {
        continue;
      }
 else {
        break;
      }
    }
  }
  if (form != null && form.containsHTML("String_Node_Str"))   throw new PluginException(LinkStatus.ERROR_CAPTCHA);
  if (br.containsHTML("String_Node_Str")) {
    br.getPage("String_Node_Str");
    wait=br.getRegex("String_Node_Str").getMatch(0);
    logger.info("String_Node_Str" + wait + "String_Node_Str");
    if (wait != null) {
      throw new PluginException(LinkStatus.ERROR_IP_BLOCKED,Integer.parseInt(wait.trim()) * 60 * 1000l);
    }
 else     throw new PluginException(LinkStatus.ERROR_IP_BLOCKED,25 * 60 * 1000l);
  }
  String url=br.getRegex("String_Node_Str").getMatch(0);
  doDownload(link,url,true,account);
}