permalink.rb in permalink-1.1.1

- old
+ new

@@ -2,7 +2,7 @@
 require "permalink/orm/base"
 require "permalink/orm/active_record"
 require "permalink/orm/mongo_mapper"
 require "permalink/orm/mongoid"
 
-ActiveRecord::Base.send(:include, Permalink::Orm::ActiveRecord)
+ActiveRecord::Base.send(:include, Permalink::Orm::ActiveRecord) if defined?(ActiveRecord)
 Mongoid::Document::ClassMethods.send(:include, Permalink::Orm::Mongoid) if defined?(Mongoid)