Index: applications/editors/josm/plugins/utilsplugin2/src/org/openstreetmap/josm/plugins/utilsplugin2/customurl/OpenPageAction.java
===================================================================
--- applications/editors/josm/plugins/utilsplugin2/src/org/openstreetmap/josm/plugins/utilsplugin2/customurl/OpenPageAction.java	(revision 33742)
+++ applications/editors/josm/plugins/utilsplugin2/src/org/openstreetmap/josm/plugins/utilsplugin2/customurl/OpenPageAction.java	(revision 33991)
@@ -66,5 +66,10 @@
                 key = m.group(1); val = null;
                 if (key.equals("#id")) {
-                    if (p != null) val = Long.toString(p.getId());
+                    if (p != null) {
+                        val = Long.toString(p.getId());
+                    } else {
+                        // id without anything selected does not make any sense, do nothing
+                        return;
+                    }
                 } else if (key.equals("#type")) {
                     if (p != null) val = OsmPrimitiveType.from(p).getAPIName();