diff --git a/telegram-application/src/core/tg_service/utils.py b/telegram-application/src/core/tg_service/utils.py
index 48971fb..fcb198c 100644
--- a/telegram-application/src/core/tg_service/utils.py
+++ b/telegram-application/src/core/tg_service/utils.py
@@ -11,7 +11,7 @@ def check_message_condition(
         message.chat.type not in [ChatType.PRIVATE, ChatType.BOT],
         bool(message.from_user),
         bool(message.text),
-        bool('bot' not in message.from_user.username.lower()),
+        bool('bot' not in message.from_user.username.lower() if message.from_user.username),
     )
     return all(conditions)