diff --git a/telethon/sessions/memory.py b/telethon/sessions/memory.py
index 881622a6..1b1a6bfb 100644
--- a/telethon/sessions/memory.py
+++ b/telethon/sessions/memory.py
@@ -130,6 +130,8 @@ class MemorySession(Session):
             entities = []
             if hasattr(tlo, 'user'):
                 entities.append(tlo.user)
+            if hasattr(tlo, 'chat'):
+                entities.append(tlo.chat)
             if hasattr(tlo, 'chats') and utils.is_list_like(tlo.chats):
                 entities.extend(tlo.chats)
             if hasattr(tlo, 'users') and utils.is_list_like(tlo.users):