diff --git a/brouter-server/src/main/java/btools/server/request/ServerHandler.java b/brouter-server/src/main/java/btools/server/request/ServerHandler.java
index 9fc4c63..1364ac0 100644
--- a/brouter-server/src/main/java/btools/server/request/ServerHandler.java
+++ b/brouter-server/src/main/java/btools/server/request/ServerHandler.java
@@ -238,7 +238,8 @@ public class ServerHandler extends RequestHandler {
 
   private static OsmNodeNamed readNogo( String lon, String lat, String radius, String nogoWeight )
   {
-    return readNogo(Double.parseDouble( lon ), Double.parseDouble( lat ), Integer.parseInt( radius ), Double.parseDouble( nogoWeight ));
+    double weight = "undefined".equals( nogoWeight ) ? Double.NaN : Double.parseDouble( nogoWeight );
+    return readNogo(Double.parseDouble( lon ), Double.parseDouble( lat ), Integer.parseInt( radius ), weight );
   }
 
   private static OsmNodeNamed readNogo( double lon, double lat, int radius, double nogoWeight )