From cdd1e3bf4cb7d79b597d58034e0837ae3837abca Mon Sep 17 00:00:00 2001
From: Robert Osfield <robert@openscenegraph.com>
Date: Fri, 24 Jun 2016 11:50:54 +0100
Subject: [PATCH] Added handling of null dynamic_cast<>

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

diff --git a/src/osgGA/FirstPersonManipulator.cpp b/src/osgGA/FirstPersonManipulator.cpp
index 5e5baa4d8..5261b0a49 100644
--- a/src/osgGA/FirstPersonManipulator.cpp
+++ b/src/osgGA/FirstPersonManipulator.cpp
@@ -383,7 +383,7 @@ bool FirstPersonManipulator::startAnimationByMousePointerIntersection(
       return false;
 
    FirstPersonAnimationData *ad = dynamic_cast< FirstPersonAnimationData*>( _animationData.get() );
-   assert( ad );
+   if (!ad) return false;
 
    // setup animation data and restore original transformation
    ad->start( prevRot, _rotation, ea.getTime() );