From 854b0d325e36acddef7a798be21a98756d86ca89 Mon Sep 17 00:00:00 2001
From: adamanldo <97370646+adamanldo@users.noreply.github.com>
Date: Fri, 20 May 2022 09:19:13 -0400
Subject: [PATCH] [StreamCZ] Fix extractor (#3789)

Closes #3579
Authored by: dirkf, adamanldo
---
 yt_dlp/extractor/streamcz.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/yt_dlp/extractor/streamcz.py b/yt_dlp/extractor/streamcz.py
index 85fc3a3c3..849a9882d 100644
--- a/yt_dlp/extractor/streamcz.py
+++ b/yt_dlp/extractor/streamcz.py
@@ -52,8 +52,8 @@ class StreamCZIE(InfoExtractor):
 
     def _extract_formats(self, spl_url, video):
         for ext, pref, streams in (
-                ('ts', -1, traverse_obj(video, ('http_stream', 'qualities'))),
-                ('mp4', 1, video.get('mp4'))):
+                ('ts', -1, traverse_obj(video, ('http_stream', 'qualities')) or {}),
+                ('mp4', 1, video.get('mp4') or {})):
             for format_id, stream in streams.items():
                 if not stream.get('url'):
                     continue