config/routes.rb in mailkick-0.2.1 vs config/routes.rb in mailkick-0.3.0

@@ -1,6 +1,8 @@
 Rails.application.routes.draw do
-  mount Mailkick::Engine => "/mailkick" if Mailkick.mount
+  unless respond_to?(:has_named_route?) && has_named_route?("mailkick")
+    mount Mailkick::Engine => "/mailkick" if Mailkick.mount
+  end
 end
 
 Mailkick::Engine.routes.draw do
   resources :subscriptions, only: [:show] do
     get :unsubscribe, on: :member