=== modified file 'dhis-2/dhis-services/dhis-service-core/src/main/java/org/hisp/dhis/query/Order.java'
--- dhis-2/dhis-services/dhis-service-core/src/main/java/org/hisp/dhis/query/Order.java	2015-11-09 07:46:37 +0000
+++ dhis-2/dhis-services/dhis-service-core/src/main/java/org/hisp/dhis/query/Order.java	2015-11-10 02:25:28 +0000
@@ -78,6 +78,11 @@
         Object o1 = ReflectionUtils.invokeMethod( lside, property.getGetterMethod() );
         Object o2 = ReflectionUtils.invokeMethod( rside, property.getGetterMethod() );
 
+        if ( o1 == null || o2 == null )
+        {
+            return 0;
+        }
+
         if ( String.class.isInstance( o1 ) && String.class.isInstance( o2 ) )
         {
             return ascending ? ((String) o1).compareTo( (String) o2 ) : ((String) o2).compareTo( (String) o1 );