diff --git a/clustering/clustering.py b/clustering/clustering.py
index ccee9b738..88f40cba0 100644
--- a/clustering/clustering.py
+++ b/clustering/clustering.py
@@ -103,7 +103,7 @@ def _average_mutual_information_reference_features_clusters(self, partition):
         Returns:
             Numpy.float: Average Mutual Information.
         """
-        reference_features, clusters = self._prepare_clustering_result_and_reference_features_for_evaluation(classes)
+        reference_features, clusters = self._prepare_clustering_result_and_reference_features_for_evaluation(partition)
         return np.average(mutual_info_classif(reference_features, clusters, discrete_features=True))
 
     def _silouhette_coeff_reference_features_clusters(self, partition):
@@ -115,7 +115,7 @@ def _silouhette_coeff_reference_features_clusters(self, partition):
         Returns:
             Numpy.float: mean Silhouette Coefficient.
         """
-        reference_features, clusters = self._prepare_clustering_result_and_reference_features_for_evaluation(classes)
+        reference_features, clusters = self._prepare_clustering_result_and_reference_features_for_evaluation(partition)
         return metrics.silhouette_score(reference_features, clusters, metric='euclidean')
 
     def _calinski_idx_reference_features_clusters(self, partition):
diff --git a/sounds/models.py b/sounds/models.py
index 70e6ad29b..2c89cf409 100644
--- a/sounds/models.py
+++ b/sounds/models.py
@@ -1684,7 +1684,7 @@ def get_pack_tags_bw(self):
                 return self.pack_tags  # If precomputed from PackManager.bulk_query_id method
             else:
                 pack_tags_counts = get_search_engine().get_pack_tags(self.user.username, self.name)
-                return [{'name': tag, 'count': count, 'browse_url': browse_pack_tag_url(tag)}
+                return [{'name': tag, 'count': count, 'browse_url': self.browse_pack_tag_url(tag)}
                         for tag, count in pack_tags_counts]
         except SearchEngineException as e:
             return []