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1 files changed, 2 insertions, 2 deletions

diff --git a/s2.py b/s2.py
index d1ee05d1..ea090845 100644
--- a/s2.py
+++ b/s2.py
@@ -142,9 +142,9 @@ class SemanticScholarAPI(object):
         try:
             resp = requests.get(url, params=kwargs, headers=SemanticScholarAPI.headers, verify=False)
             if resp.status_code != 200:
-                return None
+                return None, None
         except:
-            return None
+            return None, None
         size = 0
         with open(fn, 'wb') as f:
             for chunk in resp.iter_content(chunk_size=1024):