diff --git a/source/main/models.py b/source/main/models.py
index 9524ac1..c76a0af 100644
--- a/source/main/models.py
+++ b/source/main/models.py
@@ -179,6 +179,9 @@ class MovieQuerySet(models.QuerySet):
         """
         Enmienda ruta a medio.
         """
+        if not file_name:
+            return ''
+
         letter = file_name[0].upper()
         if letter.isdigit():
             letter = '0'