From ff38f84d04c57e54e2012592b2c0dbc829f8e4e0 Mon Sep 17 00:00:00 2001
From: Robert Osfield <robert@openscenegraph.com>
Date: Thu, 23 Jun 2016 12:32:15 +0100
Subject: [PATCH] Added initializer

---
 src/osg/GraphicsContext.cpp | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/osg/GraphicsContext.cpp b/src/osg/GraphicsContext.cpp
index 983eae9bf..b0530b976 100644
--- a/src/osg/GraphicsContext.cpp
+++ b/src/osg/GraphicsContext.cpp
@@ -904,6 +904,7 @@ void GraphicsContext::resizedImplementation(int x, int y, int width, int height)
 SyncSwapBuffersCallback::SyncSwapBuffersCallback()
 {
     OSG_INFO<<"Created SyncSwapBuffersCallback."<<std::endl;
+    _previousSync = 0;
 }
 
 void SyncSwapBuffersCallback::swapBuffersImplementation(osg::GraphicsContext* gc)