From e3225a2c4b29ade21a9d637a801ab9bc6f2ef69c Mon Sep 17 00:00:00 2001
From: Robert Osfield <robert@openscenegraph.com>
Date: Fri, 11 Feb 2011 09:18:36 +0000
Subject: [PATCH] Added check against the NodePath being empty.

---
 src/osgGA/NodeTrackerManipulator.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/osgGA/NodeTrackerManipulator.cpp b/src/osgGA/NodeTrackerManipulator.cpp
index ef3d10e9d..077dd7ee6 100644
--- a/src/osgGA/NodeTrackerManipulator.cpp
+++ b/src/osgGA/NodeTrackerManipulator.cpp
@@ -167,7 +167,7 @@ void NodeTrackerManipulator::computeNodeCenterAndRotation(osg::Vec3d& nodeCenter
     computeNodeWorldToLocal(worldToLocal);
 
     osg::NodePath nodePath;
-    if (_trackNodePath.getNodePath(nodePath))
+    if (_trackNodePath.getNodePath(nodePath) && !nodePath.empty())
         nodeCenter = osg::Vec3d(nodePath.back()->getBound().center())*localToWorld;
     else
         nodeCenter = osg::Vec3d(0.0f,0.0f,0.0f)*localToWorld;