--- Mesa-9.1/src/mesa/drivers/dri/nouveau/nouveau_driver.c.orig	2013-03-05 22:45:04.381790793 +0000
+++ Mesa-9.1/src/mesa/drivers/dri/nouveau/nouveau_driver.c	2013-03-05 22:47:45.307338871 +0000
@@ -69,7 +69,9 @@
 		__DRIdri2LoaderExtension *dri2 = screen->dri2.loader;
 		__DRIdrawable *drawable = nctx->dri_context->driDrawablePriv;
 
-		dri2->flushFrontBuffer(drawable, drawable->loaderPrivate);
+		if (drawable && drawable->loaderPrivate) {
+			dri2->flushFrontBuffer(drawable, drawable->loaderPrivate);
+		}
 	}
 }