Index: trunk/src/plugins/rt_topo/laa3_render.c
===================================================================
--- trunk/src/plugins/rt_topo/laa3_render.c	(revision 1388)
+++ trunk/src/plugins/rt_topo/laa3_render.c	(revision 1389)
@@ -62,8 +62,10 @@
 			br2 = &cr->cn->br.array[cr->cn_bridx];
 			o2 = br2->ordinfo;
 			printf(" ord: %p after %p!\n", o, o2);
-			vtp0_append(&o2->before, o);
-			o->is_before++;
+			if (o2 != NULL) {
+				vtp0_append(&o2->before, o);
+				o->is_before++;
+			}
 		}
 	}
 }