From f42f6e4fb9f8952ac5b77748357613ecea1761f5 Mon Sep 17 00:00:00 2001
From: Robert Osfield <robert@openscenegraph.com>
Date: Fri, 24 Jun 2016 11:49:14 +0100
Subject: [PATCH] Added handling or null dynamic_cast

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

diff --git a/src/osgGA/OrbitManipulator.cpp b/src/osgGA/OrbitManipulator.cpp
index bd886372a..4c72d20e2 100644
--- a/src/osgGA/OrbitManipulator.cpp
+++ b/src/osgGA/OrbitManipulator.cpp
@@ -356,7 +356,7 @@ bool OrbitManipulator::startAnimationByMousePointerIntersection(
         return false;
 
     OrbitAnimationData *ad = dynamic_cast< OrbitAnimationData*>( _animationData.get() );
-    assert( ad );
+    if (!ad) return false;
 
     // setup animation data and restore original transformation
     ad->start( osg::Vec3d(_center) - prevCenter, ea.getTime() );