From c173eb49bcad1f3cd1954a31e1f48789b82b7bf1 Mon Sep 17 00:00:00 2001
From: Robert Osfield <robert@openscenegraph.com>
Date: Sat, 30 Sep 2006 13:41:01 +0000
Subject: [PATCH] Added check to init to prevent crash when no camera
 manipulator is supplied.

---
 src/osgGA/SimpleViewer.cpp | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/osgGA/SimpleViewer.cpp b/src/osgGA/SimpleViewer.cpp
index f633adb03..9ed345648 100644
--- a/src/osgGA/SimpleViewer.cpp
+++ b/src/osgGA/SimpleViewer.cpp
@@ -116,7 +116,11 @@ void SimpleViewer::init()
 {
     osg::ref_ptr<osgGA::GUIEventAdapter> initEvent = _eventQueue->createEvent();
     initEvent->setEventType(osgGA::GUIEventAdapter::FRAME);
-    _cameraManipulator->init(*initEvent, *this);
+    
+    if (_cameraManipulator.valid())
+    {
+        _cameraManipulator->init(*initEvent, *this);
+    }
 }
 
 void SimpleViewer::frame()