From 366fcbf59b9fd97498bc711648de8dc0bb0fbd26 Mon Sep 17 00:00:00 2001
From: Robert Osfield <robert@openscenegraph.com>
Date: Wed, 30 Jan 2013 10:21:45 +0000
Subject: [PATCH] From Stephan Huber, "As I have not all referenced image-data,
 SlideShowConstructor crashed on my end. Attached is a fix for that crash."

---
 src/osgPresentation/SlideShowConstructor.cpp | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/src/osgPresentation/SlideShowConstructor.cpp b/src/osgPresentation/SlideShowConstructor.cpp
index c345818df..b0475dc2c 100644
--- a/src/osgPresentation/SlideShowConstructor.cpp
+++ b/src/osgPresentation/SlideShowConstructor.cpp
@@ -1100,11 +1100,12 @@ osg::Image* SlideShowConstructor::readImage(const std::string& filename, const I
 
         image = imageSequence;
     }
-
-    if (imageData.delayTime>0.0) image->setUserValue("delay",imageData.delayTime);
-    if (imageData.startTime>0.0) image->setUserValue("start",imageData.startTime);
-    if (imageData.stopTime>0.0) image->setUserValue("stop",imageData.stopTime);
-
+    if (image.valid())
+    {
+        if (imageData.delayTime>0.0) image->setUserValue("delay",imageData.delayTime);
+        if (imageData.startTime>0.0) image->setUserValue("start",imageData.startTime);
+        if (imageData.stopTime>0.0) image->setUserValue("stop",imageData.stopTime);
+    }
     return image.release();
 }