diff --git a/django_mailbox/models.py b/django_mailbox/models.py
index 09f22d4..94dddd9 100755
--- a/django_mailbox/models.py
+++ b/django_mailbox/models.py
@@ -223,7 +223,8 @@ class Mailbox(models.Model):
                 if part.get('Content-Disposition') is None:
                     continue
                 filename = part.get_filename()
-                # ignore SMIME extension
+                if not filename:
+                    continue
                 filename_basename, filename_extension = os.path.splitext(
                     filename
                 )