Index: trunk/src/plugins/rt_topo/laa2.c
===================================================================
--- trunk/src/plugins/rt_topo/laa2.c	(revision 1385)
+++ trunk/src/plugins/rt_topo/laa2.c	(revision 1386)
@@ -209,6 +209,10 @@
 		long n, i;
 		for(n = 0; n < tn->cross.used; n++) {
 			double offs = pt2offs(tn->cross.array[n].cn, tn->cross.array[n].x, tn->cross.array[n].y);
+
+			if (tn->cross.array[n].cn->br.used <= 1)
+				continue;
+
 			if (offs < 1.0) {
 				tn->cross.array[n].cn_bridx = -1;
 				for(i = 1; i < tn->cross.array[n].cn->br.used; i++) {