Qt application output says crashed

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I have written a small console application that prints something on QTimer timeout. I have a counter, which emits a signal to stop the QTimer when it reaches a predetermined value. Everything looks fine, except the application output says crashed when I close the console.

// main.cpp
#include <QCoreApplication>
#include <QDebug>
#include "worker.h"
#include <QThread>
#include <QTimer>
#include <QPointer>
 
int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);
 
    QTimer timer;
    Worker * worker = new Worker;
    // I tried QPointer<Worker> worker = new Worker; also but still gives the same application output
 
    QCoreApplication::connect(&timer, SIGNAL(timeout()), worker, SLOT(process()));
    QCoreApplication::connect(worker, SIGNAL(stopThread()), &timer, SLOT(stop()));
    QCoreApplication::connect(worker, SIGNAL(stopThread()), worker, SLOT(deleteLater()));
    timer.start(1000);
 
    return a.exec();
}

// main.cpp
#include <QCoreApplication>
#include <QDebug>
#include "worker.h"
#include <QThread>
#include <QTimer>
#include <QPointer>

int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);

    QTimer timer;
    Worker * worker = new Worker;
    // I tried QPointer<Worker> worker = new Worker; also but still gives the same application output

    QCoreApplication::connect(&timer, SIGNAL(timeout()), worker, SLOT(process()));
    QCoreApplication::connect(worker, SIGNAL(stopThread()), &timer, SLOT(stop()));
    QCoreApplication::connect(worker, SIGNAL(stopThread()), worker, SLOT(deleteLater()));
    timer.start(1000);

    return a.exec();
}

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//worker.h
#ifndef WORKER_H
#define WORKER_H
 
#include <QObject>
 
class Worker : public QObject
{
    Q_OBJECT
 
    int nCounter;
public:
    explicit Worker(QObject *parent = 0);
    ~Worker();
 
signals:
    void stopThread(void);
public slots:
    void process(void);
};
 
#endif // WORKER_H

//worker.h
#ifndef WORKER_H
#define WORKER_H

#include <QObject>

class Worker : public QObject
{
    Q_OBJECT

    int nCounter;
public:
    explicit Worker(QObject *parent = 0);
    ~Worker();

signals:
    void stopThread(void);
public slots:
    void process(void);
};

#endif // WORKER_H

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// worker.cpp
#include "worker.h"
#include <QDebug>
#include <QTime>
#include <QThread>
 
Worker::Worker(QObject *parent) : QObject(parent),
    nCounter(0)
{}
 
Worker::~Worker()
{
 
}
 
void Worker::process(void)
{
        nCounter++;
        qDebug() << QTime::currentTime().toString("hh:mm:ss");
        if (nCounter == 10)
        {
            qDebug() << "-x-x-x-  Count Reached 10   -x-x-x-";
            emit stopThread();
        }
}

// worker.cpp
#include "worker.h"
#include <QDebug>
#include <QTime>
#include <QThread>

Worker::Worker(QObject *parent) : QObject(parent),
    nCounter(0)
{}

Worker::~Worker()
{

}

void Worker::process(void)
{
        nCounter++;
        qDebug() << QTime::currentTime().toString("hh:mm:ss");
        if (nCounter == 10)
        {
            qDebug() << "-x-x-x-  Count Reached 10   -x-x-x-";
            emit stopThread();
        }
}

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Kindly help me identify the why the message says the application crashes.

Starting /home/rahul/Documents/build-qonsole-Desktop_Qt_5_4_1_GCC_32bit-Debug/qonsole...
/home/rahul/Documents/build-qonsole-Desktop_Qt_5_4_1_GCC_32bit-Debug/qonsole crashed

Starting /home/rahul/Documents/build-qonsole-Desktop_Qt_5_4_1_GCC_32bit-Debug/qonsole...
/home/rahul/Documents/build-qonsole-Desktop_Qt_5_4_1_GCC_32bit-Debug/qonsole crashed

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