diff --git a/youtube_dl/extractor/teachable.py b/youtube_dl/extractor/teachable.py
index b82414c3df..6b7f13b437 100644
--- a/youtube_dl/extractor/teachable.py
+++ b/youtube_dl/extractor/teachable.py
@@ -170,6 +170,7 @@ def _real_extract(self, url):
                     r'class=["\'](?:inner-)?lesson-locked',
                     r'>LESSON LOCKED<')):
                 self.raise_login_required('Lecture contents locked')
+            raise ExtractorError('Unable to find video URL')
 
         title = self._og_search_title(webpage, default=None)