Crash in QObject::killTimer

An application I am working on is crashing quite randomly because of a NULL pointer in QObject::killTimer(int id).

The NULL pointer is thisThreadData which is obtained calling d->threadData.loadRelaxed(); and then used in the rest of the code without any check.

That happens when a QTimer object is started with start(), which calls stop(), which calls QObject::killTimer().

The timer in my code is created by some code like this one:

void setupTimer()
{
    timer = new QTimer(this);
    timer->setSingleShot(true);
    timer->setInterval(timer);
    connect(timer, &QTimer::timeout, this, &MainWindow::handleTimeout);
}

The parent is a class extending QMainWindow.

Not sure if relevant, but this is happening when the timer is started in an eventFilter defined in the MainWindow class and installed on its own.

I have only experienced this crash on mac OS X, but the lack of NULL pointer check should affect every platform, that's why I haven't set the platform of this issue.