Index: /trunk/src/org/openstreetmap/josm/gui/mappaint/mapcss/Condition.java
===================================================================
--- /trunk/src/org/openstreetmap/josm/gui/mappaint/mapcss/Condition.java	(revision 8949)
+++ /trunk/src/org/openstreetmap/josm/gui/mappaint/mapcss/Condition.java	(revision 8950)
@@ -550,5 +550,5 @@
          */
         static boolean connection(Environment e) {
-            return e.osm instanceof Node && ((Node) e.osm).isConnectionNode();
+            return e.osm instanceof Node && e.osm.getDataSet() != null && ((Node) e.osm).isConnectionNode();
         }