From 0a4efa35c38649eeb7c3a0bcfc742a09068774f6 Mon Sep 17 00:00:00 2001
From: Robert Osfield <robert@openscenegraph.com>
Date: Tue, 20 Jan 2015 11:24:31 +0000
Subject: [PATCH] Changed the reset of the GLExtensions::Set() in the State
 destructor so that it checks to see if the local _glExtensions pointer has
 been set up and taken ownership of the GLExtensions::Set() value

git-svn-id: http://svn.openscenegraph.org/osg/OpenSceneGraph/trunk@14661 16af8721-9629-0410-8352-f15c8da7e697
---
 src/osg/State.cpp | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/src/osg/State.cpp b/src/osg/State.cpp
index 3650d8f2a..b318f20f4 100644
--- a/src/osg/State.cpp
+++ b/src/osg/State.cpp
@@ -132,8 +132,11 @@ State::State():
 State::~State()
 {
     // delete the GLExtensions object associated with this osg::State.
-    GLExtensions::Set(_contextID, 0);
-    _glExtensions = 0;
+    if (_glExtensions)
+    {
+        GLExtensions::Set(_contextID, 0);
+        _glExtensions = 0;
+    }
 
     //_texCoordArrayList.clear();