From 13b08034b53efdcf7055df92199a0f35cf1e172e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Sergey=20M=E2=80=A4?= <dstftw@gmail.com>
Date: Tue, 7 Apr 2020 22:54:34 +0700
Subject: [PATCH] [extractor/common] Skip malformed ISM manifest XMLs while
 extracting ISM formats (#24667)

---
 youtube_dl/extractor/common.py | 2 ++
 1 file changed, 2 insertions(+)

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)