Program: 172518
Project: 172518
Buggy source:
/** 
 * Send the message
 * @param callback will be called with response object
 */
public void send(ExecuteCallback... callback){
  if (photosToUpload.size() > 0) {
    String photo=photosToUpload.get(0);
    photosToUpload.remove(0);
    uploadPhoto(photo,response -> {
      if (!response.toString().equalsIgnoreCase("String_Node_Str")) {
        this.attachments.addIfAbsent(response.toString());
        send(callback);
      }
 else {
        LOG.error("String_Node_Str");
      }
    }
);
    return;
  }
  if (docsToUpload.size() > 0) {
    String doc=docsToUpload.get(0);
    docsToUpload.remove(0);
    uploadDoc(doc,response -> {
      if (!response.toString().equalsIgnoreCase("String_Node_Str")) {
        this.attachments.addIfAbsent(response.toString());
        send(callback);
      }
 else {
        LOG.error("String_Node_Str");
      }
    }
);
    return;
  }
  text=(text != null && text.length() > 0) ? text : "String_Node_Str";
  title=(title != null && title.length() > 0) ? title : "String_Node_Str";
  randomId=randomId != null && randomId > 0 ? randomId : 0;
  peerId=peerId != null ? peerId : -142409596;
  attachments=attachments != null && attachments.size() > 0 ? attachments : new CopyOnWriteArrayList<>();
  forwardedMessages=forwardedMessages != null && forwardedMessages.size() > 0 ? forwardedMessages : new CopyOnWriteArrayList<>();
  stickerId=stickerId != null && stickerId > 0 ? stickerId : 0;
  JSONObject params=new JSONObject();
  params.put("String_Node_Str",text);
  if (title != null && title.length() > 0)   params.put("String_Node_Str",title);
  if (randomId != null && randomId > 0)   params.put("String_Node_Str",randomId);
  params.put("String_Node_Str",peerId);
  if (attachments.size() > 0)   params.put("String_Node_Str",String.join("String_Node_Str",attachments));
  if (forwardedMessages.size() > 0)   params.put("String_Node_Str",String.join("String_Node_Str",forwardedMessages));
  if (stickerId != null && stickerId > 0)   params.put("String_Node_Str",stickerId);
  api.call("String_Node_Str",params,response -> {
    if (callback.length > 0) {
      callback[0].onResponse(response);
    }
    if (!(response instanceof Integer)) {
      LOG.error("String_Node_Str",response);
    }
  }
);
}

Fixed version (ground truth):
/** 
 * Send the message
 * @param callback will be called with response object
 */
public void send(ExecuteCallback... callback){
  if (photosToUpload.size() > 0) {
    String photo=photosToUpload.get(0);
    photosToUpload.remove(0);
    uploadPhoto(photo,response -> {
      if (!response.toString().equalsIgnoreCase("String_Node_Str")) {
        this.attachments.addIfAbsent(response.toString());
        send(callback);
      }
 else {
        LOG.error("String_Node_Str");
      }
    }
);
    return;
  }
  if (docsToUpload.size() > 0) {
    JSONObject doc=docsToUpload.get(0);
    docsToUpload.remove(0);
    uploadDoc(doc,response -> {
      if (!response.toString().equalsIgnoreCase("String_Node_Str")) {
        this.attachments.addIfAbsent(response.toString());
        send(callback);
      }
 else {
        LOG.error("String_Node_Str");
      }
    }
);
    return;
  }
  text=(text != null && text.length() > 0) ? text : "String_Node_Str";
  title=(title != null && title.length() > 0) ? title : "String_Node_Str";
  randomId=randomId != null && randomId > 0 ? randomId : 0;
  peerId=peerId != null ? peerId : -142409596;
  attachments=attachments != null && attachments.size() > 0 ? attachments : new CopyOnWriteArrayList<>();
  forwardedMessages=forwardedMessages != null && forwardedMessages.size() > 0 ? forwardedMessages : new CopyOnWriteArrayList<>();
  stickerId=stickerId != null && stickerId > 0 ? stickerId : 0;
  JSONObject params=new JSONObject();
  params.put("String_Node_Str",text);
  if (title != null && title.length() > 0)   params.put("String_Node_Str",title);
  if (randomId != null && randomId > 0)   params.put("String_Node_Str",randomId);
  params.put("String_Node_Str",peerId);
  if (attachments.size() > 0)   params.put("String_Node_Str",String.join("String_Node_Str",attachments));
  if (forwardedMessages.size() > 0)   params.put("String_Node_Str",String.join("String_Node_Str",forwardedMessages));
  if (stickerId != null && stickerId > 0)   params.put("String_Node_Str",stickerId);
  api.call("String_Node_Str",params,response -> {
    if (callback.length > 0) {
      callback[0].onResponse(response);
    }
    if (!(response instanceof Integer)) {
      LOG.error("String_Node_Str",response);
    }
  }
);
}