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-rw-r--r--youtube_dl/extractor/common.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/youtube_dl/extractor/common.py b/youtube_dl/extractor/common.py
index 3ae5d5212..34e27a35a 100644
--- a/youtube_dl/extractor/common.py
+++ b/youtube_dl/extractor/common.py
@@ -764,7 +764,7 @@ class InfoExtractor(object):
f.get('fps') if f.get('fps') is not None else -1,
f.get('filesize_approx') if f.get('filesize_approx') is not None else -1,
f.get('source_preference') if f.get('source_preference') is not None else -1,
- f.get('format_id'),
+ f.get('format_id') if f.get('format_id') is not None else '',
)
formats.sort(key=_formats_key)