diff --git a/youtube_dl/extractor/nhk.py b/youtube_dl/extractor/nhk.py
index 8ebd1969f..9bff8eab5 100644
--- a/youtube_dl/extractor/nhk.py
+++ b/youtube_dl/extractor/nhk.py
@@ -39,7 +39,6 @@ class NhkVodIE(NhkBaseIE):
             'upload_date': '20230514',
             'timestamp': 1684083791,
         },
-
     }, {
         # video clip
         'url': 'https://www3.nhk.or.jp/nhkworld/en/ondemand/video/9999011/',
diff --git a/youtube_dl/extractor/piksel.py b/youtube_dl/extractor/piksel.py
index aad4e7f7d..68611953f 100644
--- a/youtube_dl/extractor/piksel.py
+++ b/youtube_dl/extractor/piksel.py
@@ -12,7 +12,7 @@ from ..utils import (
     parse_iso8601,
     try_get,
     unescapeHTML,
-    urljoin
+    urljoin,
 )
 
 
@@ -74,9 +74,10 @@ class PikselIE(InfoExtractor):
         if mobj:
             return mobj.group('url')
 
-    def _call_api(self, app_token, resource, display_id, query, host="https://player.piksel.com", fatal=True):
-        url = urljoin(base=host, path='/ws/ws_%s/api/%s/mode/json/apiv/5' % (resource, app_token))
-        response = (self._download_json(url, display_id, query=query, fatal=fatal) or {}).get('response')
+    def _call_api(self, app_token, resource, display_id, query, host='https://player.piksel.com', fatal=True):
+        url = urljoin(host, '/ws/ws_%s/api/%s/mode/json/apiv/5' % (resource, app_token))
+        response = self._download_json(url, display_id, query=query, fatal=fatal)
+        response = traverse_obj(response, 'response', expected_type=dict) or {}
         failure = try_get(response, lambda x: x['failure']['reason'])
         if failure:
             if fatal: