diff --git a/pyrogram/client.py b/pyrogram/client.py
index f4f6eee3..7848c1f5 100644
--- a/pyrogram/client.py
+++ b/pyrogram/client.py
@@ -487,7 +487,11 @@ class Client(Methods):
             if isinstance(peer, raw.types.User):
                 peer_id = peer.id
                 access_hash = peer.access_hash
-                username = (peer.username or "").lower() or None
+                username = (
+                    peer.username.lower() if peer.username
+                    else peer.usernames[0].username.lower() if peer.usernames
+                    else None
+                )
                 phone_number = peer.phone
                 peer_type = "bot" if peer.bot else "user"
             elif isinstance(peer, (raw.types.Chat, raw.types.ChatForbidden)):