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-rw-r--r--yt_dlp/YoutubeDL.py1
1 files changed, 1 insertions, 0 deletions
diff --git a/yt_dlp/YoutubeDL.py b/yt_dlp/YoutubeDL.py
index f38697365..2a4c8c883 100644
--- a/yt_dlp/YoutubeDL.py
+++ b/yt_dlp/YoutubeDL.py
@@ -769,6 +769,7 @@ class YoutubeDL:
def add_post_processor(self, pp, when='post_process'):
"""Add a PostProcessor object to the end of the chain."""
+ assert when in POSTPROCESS_WHEN, f'Invalid when={when}'
self._pps[when].append(pp)
pp.set_downloader(self)