From b5a999b1d5e8ff4a8681a74d03f07410e631f44e Mon Sep 17 00:00:00 2001
From: bashonly <bashonly@protonmail.com>
Date: Wed, 30 Apr 2025 01:48:06 -0500
Subject: [PATCH] safer thumbnail extraction in `_extract_fallback`

Authored by: bashonly
---
 yt_dlp/extractor/zdf.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/yt_dlp/extractor/zdf.py b/yt_dlp/extractor/zdf.py
index 3832ebdda2..f9c021365a 100644
--- a/yt_dlp/extractor/zdf.py
+++ b/yt_dlp/extractor/zdf.py
@@ -498,7 +498,7 @@ query VideoByCanonical($canonical: String!) {
         ptmd_data = self._extract_ptmd_urls(ptmd_url, document_id, self._get_api_token())
 
         thumbnails = []
-        for thumbnail_key, thumbnail in traverse_obj(document, ('teaserBild', {dict.items})):
+        for thumbnail_key, thumbnail in traverse_obj(document, ('teaserBild', {dict.items}, ...)):
             thumbnail_url = traverse_obj(thumbnail, ('url', {url_or_none}))
             if not thumbnail_url:
                 continue