diff --git a/actionpack/lib/action_view/helpers/debug_helper.rb b/actionpack/lib/action_view/helpers/debug_helper.rb
index <HASH>..<HASH> 100644
--- a/actionpack/lib/action_view/helpers/debug_helper.rb
+++ b/actionpack/lib/action_view/helpers/debug_helper.rb
@@ -32,7 +32,7 @@ module ActionView
         content_tag(:pre, object, :class => "debug_dump")
       rescue Exception  # errors from Marshal or YAML
         # Object couldn't be dumped, perhaps because of singleton methods -- this is the fallback
-        content_tag(:code, object.to_yaml, :class => "debug_dump")
+        content_tag(:code, object.inspect, :class => "debug_dump")
       end
     end
   end
Fix debug helper not inspecting on Exception

The debug helper should inspect the object when it can't be converted to YAML, this behavior was changed in 8f8d8eb<I>e2ed9b6f<I>aa9d<I>e<I>f<I>.