From 582f4f834e5cb6fc783eeb51bd977aa237330e79 Mon Sep 17 00:00:00 2001
From: Dimitre Liotev <dl@liotev.com>
Date: Thu, 21 Jan 2016 08:10:41 +0200
Subject: [PATCH] Fix issue #8109 (error when downloading automatic captions)

---
 youtube_dl/extractor/youtube.py | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/youtube_dl/extractor/youtube.py b/youtube_dl/extractor/youtube.py
index d31161d21..567877920 100644
--- a/youtube_dl/extractor/youtube.py
+++ b/youtube_dl/extractor/youtube.py
@@ -964,6 +964,9 @@ class YoutubeIE(YoutubeBaseInfoExtractor):
         try:
             args = player_config['args']
             caption_url = args['ttsurl']
+            if caption_url is None or caption_url == "" or caption_url.isspace():
+                self._downloader.report_warning("No automatic captions")
+                return {}
             timestamp = args['timestamp']
             # We get the available subtitles
             list_params = compat_urllib_parse.urlencode({