diff --git a/src/client.py b/src/client.py
index 87c71b5..17b7522 100644
--- a/src/client.py
+++ b/src/client.py
@@ -1029,7 +1029,7 @@ class MCGAlbum:
 
     @staticmethod
     def compare(album1, album2, criterion=None, reverse=False):
-        if criterion == None:
+        if criterion is None:
             criterion = SortOrder.TITLE
         if criterion == SortOrder.ARTIST:
             value_function = "get_artists"