Index: dsn.c
===================================================================
--- dsn.c	(revision 35225)
+++ dsn.c	(revision 35226)
@@ -263,7 +263,8 @@
 
 
 	/* parse the tree: find wiring */
-	clear = PCB->RouteStyle.array[0].Clearance * 2;
+	if (PCB->RouteStyle.used > 0)
+		clear = PCB->RouteStyle.array[0].Clearance * 2;
 	if (strcmp(dom.root->str, "PCB") == 0)
 		type = TYPE_PCB;
 	else if (strcmp(dom.root->str, "session") == 0)