diff --git a/lib/cartodb/models/mapconfig/adapter/aggregation-mapconfig-adapter.js b/lib/cartodb/models/mapconfig/adapter/aggregation-mapconfig-adapter.js
index 91fcb5c1..b5bac9d6 100644
--- a/lib/cartodb/models/mapconfig/adapter/aggregation-mapconfig-adapter.js
+++ b/lib/cartodb/models/mapconfig/adapter/aggregation-mapconfig-adapter.js
@@ -129,9 +129,8 @@ module.exports = class AggregationMapConfigAdapter {
                     context.aggregation.layers.push(aggregatedFormats);
                 });
 
-                return requestMapConfig;
+                callback(null, requestMapConfig);
             })
-            .then(requestMapConfig => callback(null, requestMapConfig))
             .catch(err => callback(err));
     }