diff --git a/app/controllers/orbit_backend_controller.rb b/app/controllers/orbit_backend_controller.rb
index 6bc42ec9..b43a6b9a 100644
--- a/app/controllers/orbit_backend_controller.rb
+++ b/app/controllers/orbit_backend_controller.rb
@@ -103,7 +103,7 @@ class OrbitBackendController< ApplicationController
     referenced_objects = object_class.find(referer_ids) rescue nil
     if referenced_objects
       a = Array.new 
-      referenced_objects.each { |referer| a << [get_string_value_from_object(referer), referer.id] }
+      referenced_objects.to_a.each { |referer| a << [get_string_value_from_object(referer), referer.id] }
       sorted = params[:direction].eql?('asc') ? a.sort : a.sort.reverse!
       sorted_objects = sorted.collect {|x| objects.where(option => x[1]).entries }
       sorted_objects.flatten!