From 4c38068eb87c6cb9cdd234c77f2748b5faa64b6d Mon Sep 17 00:00:00 2001
From: Robert Osfield <robert@openscenegraph.com>
Date: Thu, 23 Jun 2016 16:39:36 +0100
Subject: [PATCH] Added check before using pointer

---
 src/osgViewer/ViewerBase.cpp | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/src/osgViewer/ViewerBase.cpp b/src/osgViewer/ViewerBase.cpp
index a517f3e6e..10be36d73 100644
--- a/src/osgViewer/ViewerBase.cpp
+++ b/src/osgViewer/ViewerBase.cpp
@@ -455,8 +455,11 @@ void ViewerBase::startThreading()
             if (_startRenderingBarrier.valid()) camera->getCameraThread()->add(_startRenderingBarrier.get());
 
             Renderer* renderer = dynamic_cast<Renderer*>(camera->getRenderer());
-            renderer->setGraphicsThreadDoesCull(false);
-            camera->getCameraThread()->add(renderer);
+            if (renderer)
+            {
+                renderer->setGraphicsThreadDoesCull(false);
+                camera->getCameraThread()->add(renderer);
+            }
 
             if (_endRenderingDispatchBarrier.valid())
             {