diff --git a/telethon/sessions/types.py b/telethon/sessions/types.py
index 5fb0d608..51d4ecb5 100644
--- a/telethon/sessions/types.py
+++ b/telethon/sessions/types.py
@@ -63,6 +63,7 @@ class SessionState:
         self.qts = qts
         self.date = date
         self.seq = seq
+        self.takeout_id = takeout_id
 
 
 class ChannelState: