#request_uri is deprecated.

app/helpers/application_helper.rb

@@ -24,7 +24,7 @@ module ApplicationHelper
   # Remove the locale but keep all the other params
   def get_go_back
     begin
-      if request.request_uri.include?('locale=')
+      if request.url.include?('locale=')
         session[:last_page]
       else
         target = request.referer.split('?')