diff --git a/modules/exchange_rate/__init__.py b/modules/exchange_rate/__init__.py
index 98505bd9..6770c84d 100644
--- a/modules/exchange_rate/__init__.py
+++ b/modules/exchange_rate/__init__.py
@@ -37,10 +37,8 @@ async def _(msg: Bot.MessageSession):
 #        error_type = data['error-type']
 #        raise NoReportException(f"{error_type}")
 
-    amount = None
-    while amount is None:
+    amount = float(msg.parsed_msg['<amount>'])
         try:
-            amount = float(msg.parsed_msg['<amount>'])
             if amount <= 0:
                 await msg.finish(msg.locale.t('exchange_rate.message.error.non_positive'))
         except ValueError: