diff --git a/app/presenters/presenter.rb b/app/presenters/presenter.rb
index 19497050d..1773cc0f7 100644
--- a/app/presenters/presenter.rb
+++ b/app/presenters/presenter.rb
@@ -1,6 +1,6 @@
 class Presenter
   def self.h(s)
-    CGI.escapeHTML(s)
+    CGI.escapeHTML(s.to_s)
   end
 
   def self.u(s)