Program: 172521
Project: 172521
Buggy source:
/** 
 * Listening to events from VK longpoll server and call callbacks on events. You can override only necessary methods in callback to get necessary events.
 */
private void startListening(){
  LOG.info("String_Node_Str");
  while (on) {
    JSONObject response=new JSONObject(Connection.getRequestResponse("String_Node_Str" + server + "String_Node_Str"+ key+ "String_Node_Str"+ ts+ "String_Node_Str"+ wait+ "String_Node_Str"+ mode+ "String_Node_Str"+ version+ "String_Node_Str"));
    LOG.info("String_Node_Str",response);
    if (response.has("String_Node_Str")) {
      int code=response.getInt("String_Node_Str");
      LOG.error("String_Node_Str",code);
switch (code) {
default :
{
          if (response.has("String_Node_Str")) {
            ts=response.getInt("String_Node_Str");
          }
          setData(null,null,null,null,null);
          break;
        }
case 4:
{
        version=response.getInt("String_Node_Str");
        setData(null,null,null,null,null);
        break;
      }
  }
}
 else {
  if (response.has("String_Node_Str"))   ts=response.getInt("String_Node_Str");
  if (response.has("String_Node_Str"))   this.pts=response.getInt("String_Node_Str");
  if (this.updatesHandler.callbacksCount() > 0 || this.updatesHandler.commandsCount() > 0) {
    if (response.has("String_Node_Str") && response.has("String_Node_Str")) {
      this.updatesHandler.handle(response.getJSONArray("String_Node_Str"));
    }
 else {
      LOG.error("String_Node_Str",response);
    }
  }
}
}
}

Fixed version (ground truth):
/** 
 * Listening to events from VK longpoll server and call callbacks on events. You can override only necessary methods in callback to get necessary events.
 */
private void startListening(){
  LOG.info("String_Node_Str");
  while (on) {
    JSONObject response;
    String responseString="String_Node_Str";
    try {
      responseString=Connection.getRequestResponse("String_Node_Str" + server + "String_Node_Str"+ key+ "String_Node_Str"+ ts+ "String_Node_Str"+ wait+ "String_Node_Str"+ mode+ "String_Node_Str"+ version+ "String_Node_Str");
      response=new JSONObject(responseString);
    }
 catch (    JSONException ignored) {
      LOG.error("String_Node_Str",responseString);
      continue;
    }
    LOG.info("String_Node_Str",response);
    if (response.has("String_Node_Str")) {
      int code=response.getInt("String_Node_Str");
      LOG.error("String_Node_Str",code);
switch (code) {
default :
{
          if (response.has("String_Node_Str")) {
            ts=response.getInt("String_Node_Str");
          }
          setData(null,null,null,null,null);
          break;
        }
case 4:
{
        version=response.getInt("String_Node_Str");
        setData(null,null,null,null,null);
        break;
      }
  }
}
 else {
  if (response.has("String_Node_Str"))   ts=response.getInt("String_Node_Str");
  if (response.has("String_Node_Str"))   this.pts=response.getInt("String_Node_Str");
  if (this.updatesHandler.callbacksCount() > 0 || this.updatesHandler.commandsCount() > 0) {
    if (response.has("String_Node_Str") && response.has("String_Node_Str")) {
      this.updatesHandler.handle(response.getJSONArray("String_Node_Str"));
    }
 else {
      LOG.error("String_Node_Str",response);
    }
  }
}
}
}