diff --git a/lib/cartodb/models/mapconfig_overviews_adapter.js b/lib/cartodb/models/mapconfig_overviews_adapter.js
index 7986c907..8571f7a2 100644
--- a/lib/cartodb/models/mapconfig_overviews_adapter.js
+++ b/lib/cartodb/models/mapconfig_overviews_adapter.js
@@ -17,6 +17,9 @@ MapConfigOverviewsAdapter.prototype.getLayers = function(username, layers, callb
   var augmentLayersQueue = queue(layers.length);
 
   function augmentLayer(layer, done) {
+      if ( layer.type != 'mapnik' && layer.type != 'cartodb' ) {
+          return done(null, layer);
+      }
       self.overviewsApi.getOverviewsMetadata(username, layer.options.sql, function(err, metadata){
            if (err) {
                done(err, layer);