diff --git a/archivers/base_archiver.py b/archivers/base_archiver.py
index 0f490fe..a8b0413 100644
--- a/archivers/base_archiver.py
+++ b/archivers/base_archiver.py
@@ -229,7 +229,7 @@ class Archiver(ABC):
                 cdn_urls.append(cdn_url)
 
         if len(cdn_urls) == 0:
-            return ('None', 'None')
+            return ('', '')
 
         key_thumb = cdn_urls[int(len(cdn_urls) * 0.1)]