@ -41,7 +41,7 @@ class OoyalaBaseIE(InfoExtractor):
for stream in cur_auth_data['streams']:
s_url = base64.b64decode(
stream['url']['data'].encode('ascii')).decode('utf-8')
if s_url in urls:
if not s_url or s_url in urls:
continue
urls.append(s_url)
ext = determine_ext(s_url, None)