Index: /trunk/src/org/openstreetmap/josm/io/BoundingBoxDownloader.java
===================================================================
--- /trunk/src/org/openstreetmap/josm/io/BoundingBoxDownloader.java	(revision 19405)
+++ /trunk/src/org/openstreetmap/josm/io/BoundingBoxDownloader.java	(revision 19406)
@@ -234,4 +234,6 @@
                         .forEach(i -> i.setReferrersDownloaded(true));
                 ds.getWays().forEach(i -> i.setReferrersDownloaded(true));
+                ds.getRelations().stream().filter(r -> r.getMembers().stream().noneMatch(rm -> rm.isRelation()))
+                        .forEach(i -> i.setReferrersDownloaded(true));
             }
             return ds;