Index: trunk/src/org/openstreetmap/josm/data/osm/ChangesetCache.java
===================================================================
--- trunk/src/org/openstreetmap/josm/data/osm/ChangesetCache.java	(revision 18298)
+++ trunk/src/org/openstreetmap/josm/data/osm/ChangesetCache.java	(revision 18299)
@@ -4,4 +4,5 @@
 import java.util.ArrayList;
 import java.util.Collection;
+import java.util.Collections;
 import java.util.HashMap;
 import java.util.HashSet;
@@ -274,5 +275,5 @@
             reader = new OsmServerChangesetReader();
         }
-        List<Changeset> server = reader.queryChangesets(ChangesetQuery.forCurrentUser().beingOpen(true), null);
+        List<Changeset> server = UserIdentityManager.getInstance().isAnonymous() ? Collections.emptyList() : reader.queryChangesets(ChangesetQuery.forCurrentUser().beingOpen(true), null);
         Logging.info("{0} open changesets on server", server.size());
 
Index: trunk/src/org/openstreetmap/josm/io/UploadStrategy.java
===================================================================
--- trunk/src/org/openstreetmap/josm/io/UploadStrategy.java	(revision 18298)
+++ trunk/src/org/openstreetmap/josm/io/UploadStrategy.java	(revision 18299)
@@ -93,5 +93,5 @@
      */
     public static void saveToPreferences(UploadStrategy strategy) {
-        Config.getPref().put("osm-server.upload-strategy", strategy.getPreferenceValue());
+        Config.getPref().put("osm-server.upload-strategy", strategy != null ? strategy.getPreferenceValue() : null);
     }
 }