QWindow::winId() crashes when QWindowPrivate::create() fails

void QWindowPrivate::create(bool recursive, WId nativeHandle)
...
if (!platformWindow) {
qWarning() << "Failed to create platform window for" << q << "with flags" << q->flags();
return;
} 


WId QWindow::winId() const{    
    Q_D(const QWindow);

    if(!d->platformWindow)
         const_cast<QWindow *>(this)->create();
      
    //No null check
    return d->platformWindow->winId();
}