From 93678422ef28b85e1318dc1d180b91ce45600bf5 Mon Sep 17 00:00:00 2001
From: Daniel Cassidy <mail@danielcassidy.me.uk>
Date: Tue, 17 Dec 2019 07:44:00 +0000
Subject: [PATCH] Fix crash when downloading iPlayer playlists that are not
 divided into seasons.

---
 youtube_dl/extractor/bbc.py | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/youtube_dl/extractor/bbc.py b/youtube_dl/extractor/bbc.py
index bfe6db99d..51effeba3 100644
--- a/youtube_dl/extractor/bbc.py
+++ b/youtube_dl/extractor/bbc.py
@@ -1291,7 +1291,10 @@ class BBCCoUkIPlayerPlaylistIE(BBCCoUkPlaylistBaseIE):
 
         redux_state = self._redux_state(webpage, playlist_id)
         slices = redux_state.get('header', {}).get('availableSlices', [])
-        season_ids = list(map(lambda s: s.get('id'), slices))
+        if slices:
+            season_ids = list(map(lambda s: s.get('id'), slices))
+        else:
+            season_ids = []
 
         for season in itertools.count(1):
             while True: