1 files changed, 5 insertions, 1 deletions
diff --git a/actionpack/lib/action_dispatch/routing/inspector.rb b/actionpack/lib/action_dispatch/routing/inspector.rb
index c513737fc2..bd6940fd47 100644
--- a/actionpack/lib/action_dispatch/routing/inspector.rb
+++ b/actionpack/lib/action_dispatch/routing/inspector.rb
@@ -45,7 +45,11 @@ module ActionDispatch
       end
 
       def internal?
-        controller.to_s =~ %r{\Arails/(info|mailers|welcome)} || path =~ %r{\A#{Rails.application.config.assets.prefix}\z}
+        internal_controller = controller.to_s =~ %r{\arails/(info|mailers|welcome)}
+        internal_asset = Rails.application.config.respond_to?(:assets) &&
+          path =~ %r{\a#{Rails.application.config.assets.prefix}\z}
+
+        internal_controller || internal_asset
       end
 
       def engine?