QPixmap::toWinHICON() for empty icon does`nt return NULL HICON

For example this code crashes explorer.exe if I pas the result to ItaskbarList3 Com-interface.

HICON ITaskBar::iconToHICON(const QIcon &icon) const
{
return icon.pixmap(32).toWinHICON();
}

when I call with empty icon. like as : ITaskBar::iconToHICON(QIcon());

But folowing code not crashes.

HICON ITaskBar::iconToHICON(const QIcon &icon) const
{
if (icon.isNull())
return 0;
else
return icon.pixmap(32).toWinHICON();
}

It`s normal?