On certain machines QtConcurrent crashes if no free threads on thread pool

Class BlockSizeManager (qtbase\src\concurrent\qtconcurrentiteratekernel.h) has the following expression in its constructor:

BlockSizeManager::BlockSizeManager(QThreadPool *pool, int iterationCount)
    : maxBlockSize(iterationCount / (pool->maxThreadCount() * 2)),
      beforeUser(0), afterUser(0),
      m_blockSize(1)
{ }

When pool->maxThreadCount() is zero, the division by zero exception thrown and program crashes.
function maxThreadCount implemented as following :

int QThreadPool::maxThreadCount() const
{
    Q_D(const QThreadPool);
    QMutexLocker locker(&d->mutex);
    return d->requestedMaxThreadCount;
}
It returns a variable, not a PIMPL function
Private implementation looks like this : ( qtbase\src\corelib\thread\qthreadpool_p.h )

 int maxThreadCount() const
    { return qMax(requestedMaxThreadCount, 1); }    // documentation says we start at least one

That means, the public function QThreadPool::maxThreadCount()  should return a result of private function  return d->maxThreadCount() and not a private variable.

On certain machines with limited number of CPU requestedMaxThreadCount can be zero and this leads to crash.