diff --git a/vendor/plugins/form_spam_protection/lib/form_tag_helper_extensions.rb b/vendor/plugins/form_spam_protection/lib/form_tag_helper_extensions.rb
index 63daec37..46c952da 100644
--- a/vendor/plugins/form_spam_protection/lib/form_tag_helper_extensions.rb
+++ b/vendor/plugins/form_spam_protection/lib/form_tag_helper_extensions.rb
@@ -9,8 +9,10 @@ module ActionView
             session[:form_keys] ||= {}
             form_key = Digest::SHA1.hexdigest(self.object_id.to_s + rand.to_s)
             session[:form_keys][form_key] = [Time.now, 0]
-            first = session[:form_keys].values.sort { |a,b| a[0] <=> b[0] } [0]
-            session[:form_keys].delete(session[:form_keys].index(first)) if session[:form_keys].length > 30
+            if session[:form_keys].length > 30
+              first = session[:form_keys].values.sort { |a,b| a[0] <=> b[0] } [0]
+              session[:form_keys].delete(session[:form_keys].index(first))
+            end
             out << domEnkode(form_key)
           end
         end