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-rwxr-xr-xyoutube_dl/YoutubeDL.py4
1 files changed, 2 insertions, 2 deletions
diff --git a/youtube_dl/YoutubeDL.py b/youtube_dl/YoutubeDL.py
index 0b3e3da82..c499c1da4 100755
--- a/youtube_dl/YoutubeDL.py
+++ b/youtube_dl/YoutubeDL.py
@@ -1256,8 +1256,8 @@ class YoutubeDL(object):
info_dict['thumbnails'] = thumbnails = [{'url': thumbnail}]
if thumbnails:
thumbnails.sort(key=lambda t: (
- t.get('preference'), t.get('width'), t.get('height'),
- t.get('id'), t.get('url')))
+ t.get('preference') or -1, t.get('width') or -1, t.get('height') or -1,
+ t.get('id') or '', t.get('url')))
for i, t in enumerate(thumbnails):
t['url'] = sanitize_url(t['url'])
if t.get('width') and t.get('height'):