diff --git a/main.py b/main.py
index 1607c26..515c58a 100644
--- a/main.py
+++ b/main.py
@@ -943,9 +943,11 @@ async def list_chats(chat_type: str = None, limit: int = 20) -> str:
             unread_count = getattr(dialog, "unread_count", 0) or 0
             # Also check unread_mark (manual "mark as unread" flag)
             inner_dialog = getattr(dialog, "dialog", None)
-            unread_mark = bool(
-                getattr(inner_dialog, "unread_mark", False))
-                if inner_dialog else False
+            unread_mark = (
+                bool(getattr(inner_dialog, "unread_mark", False))
+                if inner_dialog
+                else False
+            )
 
             if unread_count > 0:
                 chat_info += f", Unread: {unread_count}"