Index: /applications/editors/josm/plugins/splinex/src/org/openstreetmap/josm/plugins/Splinex/DrawSplineAction.java
===================================================================
--- /applications/editors/josm/plugins/splinex/src/org/openstreetmap/josm/plugins/Splinex/DrawSplineAction.java	(revision 35865)
+++ /applications/editors/josm/plugins/splinex/src/org/openstreetmap/josm/plugins/Splinex/DrawSplineAction.java	(revision 35866)
@@ -396,5 +396,5 @@
     @Override
     public boolean layerIsSupported(Layer l) {
-        return l instanceof OsmDataLayer;
+        return isEditableDataLayer(l);
     }