diff --git a/scripts/upload2qiniu.py b/scripts/upload2qiniu.py
index c3331ca..45ce526 100644
--- a/scripts/upload2qiniu.py
+++ b/scripts/upload2qiniu.py
@@ -22,8 +22,9 @@ def __init__(self, access_key, secret_key, bucket_name: str):
     def upload_file(self, key, localfile):
         token = self._auth.upload_token(self._bucket, key)
         ret, info = put_file(token, key, localfile)
-        assert ret['key'] == key
-        assert ret['hash'] == etag(localfile)
+        if ret: # ret possibly is None
+            assert ret['key'] == key
+            assert ret['hash'] == etag(localfile)
         return info