diff --git a/0001-Avoid-crash-when-a-comment-contains-data-but-no-text.patch b/0001-Avoid-crash-when-a-comment-contains-data-but-no-text.patch
new file mode 100644
index 0000000..366b440
--- /dev/null
+++ b/0001-Avoid-crash-when-a-comment-contains-data-but-no-text.patch
@@ -0,0 +1,36 @@
+From 3750deae3e2d8fcf8bcf795fe327e1da370a2c4d Mon Sep 17 00:00:00 2001
+From: Katarina Behrens <bubli@bubli.org>
+Date: Fri, 13 Sep 2013 17:29:12 +0200
+Subject: [PATCH] Avoid crash when a comment contains data, but no text
+
+calling back() on empty vector results in undef behaviour
+
+Crash originally reported here:
+http://lists.freedesktop.org/archives/libreoffice/2013-September/055827.html
+
+Change-Id: Ibefdc7e2495fc31d748c16fedd3cee5eb957bfa2
+---
+ oox/source/ppt/presentationfragmenthandler.cxx | 6 +++++-
+ 1 file changed, 5 insertions(+), 1 deletion(-)
+
+diff --git a/oox/source/ppt/presentationfragmenthandler.cxx b/oox/source/ppt/presentationfragmenthandler.cxx
+index 247b81b..826130c 100644
+--- a/oox/source/ppt/presentationfragmenthandler.cxx
++++ b/oox/source/ppt/presentationfragmenthandler.cxx
+@@ -323,8 +323,12 @@ void PresentationFragmentHandler::importSlide(sal_uInt32 nSlide, sal_Bool bFirst
+                 //set comment chars for last comment on slide
+                 SlideFragmentHandler* comment_handler =
+                     dynamic_cast<SlideFragmentHandler*>(xCommentsFragmentHandler.get());
++                // some comments have no text -> set empty string as text to avoid
++                // crash (back() on empty vector is undefined) and losing other
++                // comment data that might be there (author, position, timestamp etc.)
+                 pCommentsPersistPtr->getCommentsList().cmLst.back().setText(
+-                    comment_handler->getCharVector().back() );
++                        comment_handler->getCharVector().empty() ? "" :
++                        comment_handler->getCharVector().back() );
+                 pCommentsPersistPtr->getCommentAuthors().setValues(maAuthorList);
+ 
+                 //insert all comments from commentsList
+-- 
+1.8.3.1
+
diff --git a/libreoffice.spec b/libreoffice.spec
index b9212e4..ffce306 100644
--- a/libreoffice.spec
+++ b/libreoffice.spec
@@ -257,6 +257,7 @@ Patch16: 0001-Resolves-fdo-48835-application-menu-for-LibreOffice.patch
 Patch17: 0001-Make-charmap.cxx-compile-with-icu-4.4.patch
 Patch18: 0001-Resolves-rhbz-1006850-crash-in-SwCommentRuler-GetCom.patch
 Patch19: 0001-select-sheet-menu-as-a-right-click-popup-to-the-prev.patch
+Patch20: 0001-Avoid-crash-when-a-comment-contains-data-but-no-text.patch
 
 %define instdir %{_libdir}
 %define baseinstdir %{instdir}/libreoffice
@@ -1008,6 +1009,7 @@ mv -f redhat.soc extras/source/palettes/standard.soc
 %patch17 -p1 -b .Make-charmap.cxx-compile-with-icu-4.4.patch
 %patch18 -p1 -b .rhbz-1006850-crash-in-SwCommentRuler-GetCom.patch
 %patch19 -p1 -b .select-sheet-menu-as-a-right-click-popup-to-the-prev.patch
+%patch20 -p1 -b .Avoid-crash-when-a-comment-contains-data-but-no-text.patch
 
 # TODO: check this
 # these are horribly incomplete--empty translations and copied english
@@ -2098,8 +2100,9 @@ update-desktop-database %{_datadir}/applications &> /dev/null || :
 %endif
 
 %changelog
-* Fri Sep 13 2013 Caolán McNamara <caolanm@redhat.com> - 1:4.1.2.1-3.UNBUILT
+* Tue Sep 17 2013 Caolán McNamara <caolanm@redhat.com> - 1:4.1.2.1-3
 - add select sheet menu to calc prev/next area
+- Resolves: rhbz#988104 crash on certain pptx
 
 * Thu Sep 12 2013 Caolán McNamara <caolanm@redhat.com> - 1:4.1.2.1-2
 - Resolves: rhbz#1006850 crash in SwCommentRuler