Index: applications/editors/josm/plugins/roadsigns/src/org/openstreetmap/josm/plugins/roadsigns/Sign.java
===================================================================
--- applications/editors/josm/plugins/roadsigns/src/org/openstreetmap/josm/plugins/roadsigns/Sign.java	(revision 23192)
+++ applications/editors/josm/plugins/roadsigns/src/org/openstreetmap/josm/plugins/roadsigns/Sign.java	(revision 27675)
@@ -82,5 +82,5 @@
     public ImageIcon getIcon() {
         if (icon == null) {
-            icon = ImageProvider.getIfAvailable(RoadSignsPlugin.iconDirs, "plugin.sign."+id, null, iconURL, null);
+            icon = new ImageProvider(iconURL).setDirs(RoadSignsPlugin.iconDirs).setId("plugin.sign."+id).setOptional(true).get();
         }
         return icon;