--- Mesa-6.5/src/mesa/main/framebuffer.c.ctx	2006-03-31 12:29:47.000000000 -0500
+++ Mesa-6.5/src/mesa/main/framebuffer.c	2006-09-16 09:58:32.000000000 -0400
@@ -306,7 +306,8 @@
    fb->Height = height;
 
    /* to update scissor / window bounds */
-   _mesa_update_draw_buffer_bounds(ctx);
+   if (ctx)
+      _mesa_update_draw_buffer_bounds(ctx);
 }