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-rw-r--r--youtube_dl/utils.py3
1 files changed, 3 insertions, 0 deletions
diff --git a/youtube_dl/utils.py b/youtube_dl/utils.py
index f333e4712..7bcc85e2b 100644
--- a/youtube_dl/utils.py
+++ b/youtube_dl/utils.py
@@ -1935,6 +1935,9 @@ def error_to_compat_str(err):
def mimetype2ext(mt):
+ if mt is None:
+ return None
+
ext = {
'audio/mp4': 'm4a',
}.get(mt)