Index: trunk/src/org/openstreetmap/josm/gui/layer/markerlayer/Marker.java
===================================================================
--- trunk/src/org/openstreetmap/josm/gui/layer/markerlayer/Marker.java	(revision 4803)
+++ trunk/src/org/openstreetmap/josm/gui/layer/markerlayer/Marker.java	(revision 4804)
@@ -267,5 +267,5 @@
         // /* ICON(markers/) */"Bridge"
         // /* ICON(markers/) */"Crossing"
-        this.symbol = ImageProvider.getIfAvailable("markers",iconName);
+        this.symbol = iconName != null ? ImageProvider.getIfAvailable("markers",iconName) : null;
         this.parentLayer = parentLayer;
 
@@ -281,5 +281,5 @@
         // /* ICON(markers/) */"Bridge"
         // /* ICON(markers/) */"Crossing"
-        this.symbol = ImageProvider.getIfAvailable("markers",iconName);
+        this.symbol = iconName != null ? ImageProvider.getIfAvailable("markers",iconName) : null;
         this.parentLayer = parentLayer;