--- Mesa-6.5.2/src/mesa/drivers/dri/common/dri_util.c.jx	2006-12-02 13:14:16.000000000 -0500
+++ Mesa-6.5.2/src/mesa/drivers/dri/common/dri_util.c	2007-04-04 12:41:08.000000000 -0400
@@ -271,6 +271,8 @@
     __DRIdrawablePrivate *prp;
     __DRIcontextPrivate * const pcp = ctx->private;
 
+    if (!pcp)
+	return GL_FALSE;
 
     /* Find the _DRIdrawable which corresponds to the writing drawable. */
     pdraw = __driFindDrawable(psp->drawHash, draw);