Index: applications/editors/josm/plugins/mapillary/src/org/openstreetmap/josm/plugins/mapillary/MapillaryLayer.java
===================================================================
--- applications/editors/josm/plugins/mapillary/src/org/openstreetmap/josm/plugins/mapillary/MapillaryLayer.java	(revision 31487)
+++ applications/editors/josm/plugins/mapillary/src/org/openstreetmap/josm/plugins/mapillary/MapillaryLayer.java	(revision 31488)
@@ -132,10 +132,11 @@
     }
     createHatchTexture();
-
-    MapillaryMainDialog.getInstance()
-        .getInputMap(JComponent.WHEN_IN_FOCUSED_WINDOW)
-        .put(KeyStroke.getKeyStroke("DELETE"), "MapillaryDel");
-    MapillaryMainDialog.getInstance().getActionMap()
-        .put("MapillaryDel", new DeleteImageAction());
+    if (Main.main != null) {
+      MapillaryMainDialog.getInstance()
+          .getInputMap(JComponent.WHEN_IN_FOCUSED_WINDOW)
+          .put(KeyStroke.getKeyStroke("DELETE"), "MapillaryDel");
+      MapillaryMainDialog.getInstance().getActionMap()
+          .put("MapillaryDel", new DeleteImageAction());
+    }
 
     if (Main.main != null)