Index: trunk/src/org/openstreetmap/josm/io/OsmJsonReader.java
===================================================================
--- trunk/src/org/openstreetmap/josm/io/OsmJsonReader.java	(revision 19645)
+++ trunk/src/org/openstreetmap/josm/io/OsmJsonReader.java	(revision 19646)
@@ -65,5 +65,6 @@
 
     private void parseRoot(JsonObject object) throws IllegalDataException {
-        parseVersion(object.get("version").toString());
+        JsonValue version = object.get("version");
+        parseVersion(version != null ? version.toString() : null);
         parseDownloadPolicy("download", object.getString("download", null));
         parseUploadPolicy("upload", object.getString("upload", null));