gistfile1.txt

diff --git a/Source/WebKit/chromium/src/WebLayerTreeView.cpp b/Source/WebKit/chromium/src/WebLayerTreeView.cpp
index fed3db9..7de17fd 100644
--- a/Source/WebKit/chromium/src/WebLayerTreeView.cpp
+++ b/Source/WebKit/chromium/src/WebLayerTreeView.cpp
@@ -167,7 +167,10 @@ void WebLayerTreeView::finishAllRendering()
 
 WebGraphicsContext3D* WebLayerTreeView::context()
 {
-    return GraphicsContext3DPrivate::extractWebGraphicsContext3D(m_private->layerTreeHost()->context()->context3D());
+    WebCore::CCGraphicsContext* c = m_private->layerTreeHost()->context();
+    if (!c)
+        return 0;
+    return GraphicsContext3DPrivate::extractWebGraphicsContext3D(c->context3D());
 }
 
 void WebLayerTreeView::loseCompositorContext(int numTimes)