Index: trunk/src/org/openstreetmap/josm/io/NoteImporter.java
===================================================================
--- trunk/src/org/openstreetmap/josm/io/NoteImporter.java	(revision 9796)
+++ trunk/src/org/openstreetmap/josm/io/NoteImporter.java	(revision 9797)
@@ -38,5 +38,5 @@
         try (InputStream is = Compression.getUncompressedFileInputStream(file)) {
             final NoteLayer layer = loadLayer(is, file, file.getName(), progressMonitor);
-            if (!Main.map.mapView.hasLayer(layer)) {
+            if (Main.map == null || !Main.map.mapView.hasLayer(layer)) {
                 GuiHelper.runInEDT(new Runnable() {
                     @Override