diff --git a/bsc1179025.diff b/bsc1179025.diff
new file mode 100644
index 0000000..3156fc1
--- /dev/null
+++ b/bsc1179025.diff
@@ -0,0 +1,43 @@
+From 9a10330ff8fb0499ed8b0a91563b3c7f62b94096 Mon Sep 17 00:00:00 2001
+From: Miklos Vajna <vmiklos@collabora.com>
+Date: Tue, 12 Jan 2021 10:13:14 +0100
+Subject: [PATCH] bsc1179025.diff
+
+oox smartart: fix crash in pyra algorithm with a single child shape
+
+Regression from commit 14a56533ff2c9c859d22cd3039ada75b99e94bc0
+(SmartArt Pyramid: Now lays out shapes, 2018-07-10), the added pyramid
+algorithm by first centering the topmost children, then decrementing the
+horizontal postion of each additional shape, with the end goal of having
+0 horizontal position of the last children.
+
+This means that simply avoiding the division in the 1-child case leads
+to correct results, because in this case the only child is also the last
+child at the sane time.
+
+(cherry picked from commit f2e04fe98e313cffa3f98d55eae641415142a431)
+
+Change-Id: Ifd0027e9616b0909dbfde43e1555427b50de4dad
+---
+ oox/source/drawingml/diagram/diagramlayoutatoms.cxx | 5 ++++-
+ 1 file changed, 4 insertions(+), 1 deletion(-)
+
+diff --git a/oox/source/drawingml/diagram/diagramlayoutatoms.cxx b/oox/source/drawingml/diagram/diagramlayoutatoms.cxx
+index 7f926cc9a5e8..24acaf176491 100644
+--- a/oox/source/drawingml/diagram/diagramlayoutatoms.cxx
++++ b/oox/source/drawingml/diagram/diagramlayoutatoms.cxx
+@@ -1286,7 +1286,10 @@ void AlgAtom::layoutShape(const ShapePtr& rShape, const std::vector<Constraint>&
+             for (auto & aCurrShape : rShape->getChildren())
+             {
+                 aCurrShape->setPosition(aCurrPos);
+-                aCurrPos.X -=  aChildSize.Height/(nCount-1);
++                if (nCount > 1)
++                {
++                    aCurrPos.X -= aChildSize.Height / (nCount - 1);
++                }
+                 aChildSize.Width += aChildSize.Height;
+                 aCurrShape->setSize(aChildSize);
+                 aCurrShape->setChildSize(aChildSize);
+-- 
+2.26.2
+
diff --git a/libreoffice.changes b/libreoffice.changes
index 6dc9f03..bf335bc 100644
--- a/libreoffice.changes
+++ b/libreoffice.changes
@@ -1,3 +1,9 @@
+-------------------------------------------------------------------
+Thu Jan 14 08:44:52 UTC 2021 - Andras Timar <andras.timar@collabora.com>
+
+- Fix bsc#1179025 - LO-L3: LibreOffice crashes opening a PPTX
+  * bsc1179025.diff
+
 -------------------------------------------------------------------
 Tue Jan 12 10:32:53 UTC 2021 - Andras Timar <andras.timar@collabora.com>
 
diff --git a/libreoffice.spec b/libreoffice.spec
index f4adb25..3a36d9d 100644
--- a/libreoffice.spec
+++ b/libreoffice.spec
@@ -106,6 +106,8 @@ Patch6:         bsc1178943.diff
 Patch7:         icu68.patch
 # Bug 1178807 - LO-L3: Text box from PowerPoint renders vertically instead of horizontally
 Patch8:         bsc1178807.diff
+# Bug 1179025 - LO-L3: LibreOffice crashes opening a PPTX
+Patch9:         bsc1179025.diff
 # try to save space by using hardlinks
 Patch990:       install-with-hardlinks.diff
 # save time by relying on rpm check rather than doing stupid find+grep
@@ -968,6 +970,7 @@ Provides %{langname} translations and additional resources (help files, etc.) fo
 %patch6 -p1
 %patch7 -p1
 %patch8 -p1
+%patch9 -p1
 %patch990 -p1
 %patch991 -p1