--- xenocara/dist/Mesa/src/mesa/main/context.c.orig	Fri Aug  1 16:41:13 2008
+++ xenocara/dist/Mesa/src/mesa/main/context.c	Fri Aug  1 16:41:39 2008
@@ -656,7 +656,9 @@
 {
    struct gl_renderbuffer *rb = (struct gl_renderbuffer *) data;
    rb->RefCount = 0;  /* see comment for FBOs above */
-   rb->Delete(rb);
+
+   if (rb->Delete)
+      rb->Delete(rb);
 }