Index: plugins/rt_topo/crbs_route.c
===================================================================
--- plugins/rt_topo/crbs_route.c	(revision 1442)
+++ plugins/rt_topo/crbs_route.c	(revision 1443)
@@ -196,6 +196,10 @@
 		crbs_grbs_draw(crbs, tmp);
 	}
 
+ /* Extra paranoia (expensive): previous hop_next ended in detach or cleanup so
+    it should have removed all ->new */
+	assert(grbs_count_new(&crbs->grbs) == 0);
+
 	froma = grbs_reattach_addr(&crbs->grbs, curr);
 	if (froma == NULL) {
 		printf(" Neigh: can't reattach curr\n");