diff --git a/app.py b/app.py
index c47d771..a1271f5 100644
--- a/app.py
+++ b/app.py
@@ -54,9 +54,9 @@ def validate_collision(path):
 
 def name_format(path, meta):
     information = {
-        'artist': ','.join([artist[0] for artist in meta['artist']]),
-        'title': meta['musicName'],
-        'album': meta['album']
+        'artist': ','.join([artist[0] for artist in (meta.get('artist') if meta.get('artist') is not None else [])]),
+        'title': meta.get('musicName'),
+        'album': meta.get('album')
     }
 
     def substitute(matched):
diff --git a/requirements.txt b/requirements.txt
index 97a6859..db67121 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,2 +1,3 @@
+Crypto
 mutagen
 pycryptodome