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-rw-r--r--youtube_dl/extractor/frontendmasters.py3
1 files changed, 2 insertions, 1 deletions
diff --git a/youtube_dl/extractor/frontendmasters.py b/youtube_dl/extractor/frontendmasters.py
index 770db46d0..cb57ba007 100644
--- a/youtube_dl/extractor/frontendmasters.py
+++ b/youtube_dl/extractor/frontendmasters.py
@@ -11,6 +11,7 @@ from ..compat import (
from ..utils import (
ExtractorError,
parse_duration,
+ url_or_none,
urlencode_postdata,
)
@@ -80,7 +81,7 @@ class FrontendMastersPageBaseIE(FrontendMastersBaseIE):
chapters = []
lesson_elements = course.get('lessonElements')
if isinstance(lesson_elements, list):
- chapters = [e for e in lesson_elements if isinstance(e, compat_str)]
+ chapters = [url_or_none(e) for e in lesson_elements if url_or_none(e)]
return chapters
@staticmethod