diff --git a/main.py b/main.py
index ddedf11..3b141f5 100644
--- a/main.py
+++ b/main.py
@@ -589,7 +589,7 @@ def join(bot, update):
         game.message(bot, s.error_player_already_joined)
         return
     # Giocatore senza username
-    if not (hasattr(update.message, "from_user") and 'username' in update.message.from_user):
+    if update.message.from_user["username"] is not None:
         game.message(bot, s.error_no_username)
         return
     p = Player(update.message.from_user['id'], update.message.from_user['username'])