In addition to 41cfc86d.

This fixes another crash when browsing help file that I have here.
Signed-off-by: Dmitry Timoshkov <dmitry@baikal.ru>
Signed-off-by: Jacek Caban <jacek@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>