Index: trunk/src/org/openstreetmap/josm/data/osm/FilterMatcher.java
===================================================================
--- trunk/src/org/openstreetmap/josm/data/osm/FilterMatcher.java	(revision 12119)
+++ trunk/src/org/openstreetmap/josm/data/osm/FilterMatcher.java	(revision 12121)
@@ -225,5 +225,6 @@
     private static FilterType test(List<FilterInfo> filters, OsmPrimitive primitive, boolean hidden) {
 
-        if (primitive.isIncomplete() || (Main.map != null && Main.map.mapMode.getPreservedPrimitives().contains(primitive)))
+        if (primitive.isIncomplete() ||
+                (Main.map != null && Main.map.mapMode != null && Main.map.mapMode.getPreservedPrimitives().contains(primitive)))
             return FilterType.NOT_FILTERED;