diff --git a/app/controllers/stats_controller.rb b/app/controllers/stats_controller.rb
index a093747..0eae584 100644
--- a/app/controllers/stats_controller.rb
+++ b/app/controllers/stats_controller.rb
@@ -25,17 +25,18 @@ class StatsController < ApplicationController
 
   # Genera un gráfico de visitas por dominio asociado a este sitio
   def host
-
-    @stats = Rollup.where_dimensions(host: hostnames).multi_series('host', interval: interval).tap do |series|
-      series.each do |serie|
-        serie[:name] = serie.dig(:dimensions, 'host')
-        serie[:data].transform_values! do |value|
-          value * nodes
+    if stale? [last_stat, hostnames, interval]
+      stats = Rollup.where_dimensions(host: hostnames).multi_series('host', interval: interval).tap do |series|
+        series.each do |serie|
+          serie[:name] = serie.dig(:dimensions, 'host')
+          serie[:data].transform_values! do |value|
+            value * nodes
+          end
         end
       end
     end
 
-    render json: @stats
+    render json: stats
   end
 
   private