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-rw-r--r--youtube_dl/extractor/common.py2
1 files changed, 2 insertions, 0 deletions
diff --git a/youtube_dl/extractor/common.py b/youtube_dl/extractor/common.py
index eaae5e484..c51a3a07d 100644
--- a/youtube_dl/extractor/common.py
+++ b/youtube_dl/extractor/common.py
@@ -2340,6 +2340,8 @@ class InfoExtractor(object):
if res is False:
return []
ism_doc, urlh = res
+ if ism_doc is None:
+ return []
return self._parse_ism_formats(ism_doc, urlh.geturl(), ism_id)