diff --git a/telethon/client/uploads.py b/telethon/client/uploads.py
index 57d1c790..bcc87b5d 100644
--- a/telethon/client/uploads.py
+++ b/telethon/client/uploads.py
@@ -496,7 +496,7 @@ class UploadMethods:
 
         # Now we can construct the multi-media request
         request = functions.messages.SendMultiMediaRequest(
-            entity, reply_to=types.InputReplyToMessage(reply_to), multi_media=media,
+            entity, reply_to=None if reply_to is None else types.InputReplyToMessage(reply_to), multi_media=media,
             silent=silent, schedule_date=schedule, clear_draft=clear_draft,
             background=background
         )
diff --git a/telethon/version.py b/telethon/version.py
index 384693ea..904ff1bc 100644
--- a/telethon/version.py
+++ b/telethon/version.py
@@ -1,3 +1,3 @@
 # Versions should comply with PEP440.
 # This line is parsed in setup.py:
-__version__ = '1.29.1'
+__version__ = '1.29.2'