From c61c3d5500a4bd239b6699e6f3ca003be592f59f Mon Sep 17 00:00:00 2001
From: Robert Osfield <robert@openscenegraph.com>
Date: Thu, 16 Apr 2015 10:07:23 +0000
Subject: [PATCH] Fixed crash when AntiSquish node is the root of the scene
 graph.

git-svn-id: http://svn.openscenegraph.org/osg/OpenSceneGraph/trunk@14840 16af8721-9629-0410-8352-f15c8da7e697
---
 src/osgManipulator/AntiSquish.cpp | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/osgManipulator/AntiSquish.cpp b/src/osgManipulator/AntiSquish.cpp
index 68115a714..9ba61164e 100644
--- a/src/osgManipulator/AntiSquish.cpp
+++ b/src/osgManipulator/AntiSquish.cpp
@@ -98,8 +98,10 @@ bool AntiSquish::computeUnSquishedMatrix(osg::Matrix& unsquished) const
     OpenThreads::ScopedLock<OpenThreads::Mutex> lock( _cacheLock );
 
     osg::NodePathList nodePaths = getParentalNodePaths();
-    osg::NodePath np;
-    if (!nodePaths.empty()) np = nodePaths.front();
+    if (nodePaths.empty()) return false;
+
+    osg::NodePath np = nodePaths.front();
+    if (np.empty()) return false;
 
     // Remove the last node which is the anti squish node itself.
     np.pop_back();