gistfile1.diff

diff --git a/lib/caching_presenter.rb b/lib/caching_presenter.rb
index 0b11077..4578511 100644
--- a/lib/caching_presenter.rb
+++ b/lib/caching_presenter.rb
@@ -33,7 +33,11 @@ class CachingPresenter
         @cached_instance_methods = Hash.new{ |h,k| h[k] = {}}
         write_constructor :presents => @presents, :options => options
         %w(class id to_param).each do |method|
-          undef_method method if respond_to?(method)
+          begin
+            undef_method method if respond_to?(method)
+          rescue NameError
+            # Under Ruby 1.9, this is failing for to_param. Need to investigate further.
+          end
         end
       else
         @presents