diff --git a/src/torio/io/_streaming_media_decoder.py b/src/torio/io/_streaming_media_decoder.py
index 8e81b537e7..bd5d8807d5 100644
--- a/src/torio/io/_streaming_media_decoder.py
+++ b/src/torio/io/_streaming_media_decoder.py
@@ -338,7 +338,8 @@ class ChunkTensor(ChunkTensorBase):
 
 def _format_doc(**kwargs):
     def decorator(obj):
-        obj.__doc__ = obj.__doc__.format(**kwargs)
+        if obj.__doc__ is not None:
+            obj.__doc__ = obj.__doc__.format(**kwargs)
         return obj
 
     return decorator
diff --git a/src/torio/io/_streaming_media_encoder.py b/src/torio/io/_streaming_media_encoder.py
index bfbfe8791b..7fb42b6288 100644
--- a/src/torio/io/_streaming_media_encoder.py
+++ b/src/torio/io/_streaming_media_encoder.py
@@ -48,7 +48,8 @@ def _convert_config(cfg: CodecConfig):
 
 def _format_doc(**kwargs):
     def decorator(obj):
-        obj.__doc__ = obj.__doc__.format(**kwargs)
+        if obj.__doc__ is not None:
+            obj.__doc__ = obj.__doc__.format(**kwargs)
         return obj
 
     return decorator