diff --git a/main.py b/main.py
index cc590c2..5420bc6 100644
--- a/main.py
+++ b/main.py
@@ -942,6 +942,7 @@ async def list_chats(chat_type: str = None, limit: int = 20) -> str:
             # Add unread count if available
             unread_count = getattr(dialog, "unread_count", 0)
             # Also check unread_mark (manual "mark as unread" flag)
+            inner_dialog = getattr(dialog, "dialog", None)
             unread_mark = (
                 getattr(dialog.dialog, "unread_mark", False)
                 if hasattr(dialog, "dialog")