From 1538ecf113d6a77c689fd4360f72f5b9c31b68c0 Mon Sep 17 00:00:00 2001
From: Robert Osfield <robert@openscenegraph.com>
Date: Mon, 24 Oct 2011 11:09:35 +0000
Subject: [PATCH] Fixed handling of slide with no layers.

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

diff --git a/src/osgPresentation/SlideEventHandler.cpp b/src/osgPresentation/SlideEventHandler.cpp
index 8bf00e99d..04559e28f 100644
--- a/src/osgPresentation/SlideEventHandler.cpp
+++ b/src/osgPresentation/SlideEventHandler.cpp
@@ -1188,7 +1188,7 @@ bool SlideEventHandler::previousSlide()
 
 bool SlideEventHandler::nextLayer()
 {
-    LayerAttributes* la = (_slideSwitch.valid() && _activeLayer>=0) ? dynamic_cast<LayerAttributes*>(_slideSwitch->getChild(_activeLayer)->getUserData()) : 0;
+    LayerAttributes* la = (_slideSwitch.valid() && _activeLayer<static_cast<int>(_slideSwitch->getNumChildren())) ? dynamic_cast<LayerAttributes*>(_slideSwitch->getChild(_activeLayer)->getUserData()) : 0;
     if (la)
     {
         la->callLeaveCallbacks(_slideSwitch->getChild(_activeLayer));