diff --git a/brouter-routing-app/src/main/java/btools/routingapp/BRouterWorker.java b/brouter-routing-app/src/main/java/btools/routingapp/BRouterWorker.java
index 8f174dc..33ee802 100644
--- a/brouter-routing-app/src/main/java/btools/routingapp/BRouterWorker.java
+++ b/brouter-routing-app/src/main/java/btools/routingapp/BRouterWorker.java
@@ -46,7 +46,7 @@ public class BRouterWorker {
 
     RoutingContext rc = new RoutingContext();
     rc.rawTrackPath = rawTrackPath;
-    rc.rawAreaPath = rawTrackPath.substring(0, rawTrackPath.lastIndexOf(File.separator)+1) + "rawAreaInfo.dat";
+    rc.rawAreaPath = (rawTrackPath != null ? rawTrackPath.substring(0, rawTrackPath.lastIndexOf(File.separator)+1) + "rawAreaInfo.dat" : null);
     rc.localFunction = profilePath;
 
     RoutingParamCollector routingParamCollector = new RoutingParamCollector();