diff --git a/lib/cartodb/models/mapconfig/provider/named-map-provider.js b/lib/cartodb/models/mapconfig/provider/named-map-provider.js
index 513fb7b7..298920a1 100644
--- a/lib/cartodb/models/mapconfig/provider/named-map-provider.js
+++ b/lib/cartodb/models/mapconfig/provider/named-map-provider.js
@@ -74,8 +74,8 @@ module.exports = class NamedMapMapConfigProvider extends BaseMapConfigProvider {
                         JSON.parse(this.config) :
                         this.config;
                 } catch (e) {
-                    const error = new Error('malformed config parameter, should be a valid JSON');
-                    this.err = error;
+                    const err = new Error('malformed config parameter, should be a valid JSON');
+                    this.err = err;
 
                     return callback(err);
                 }