diff --git a/packages/astrbot/main.py b/packages/astrbot/main.py
index 6bbb9555a..90f92c2c8 100644
--- a/packages/astrbot/main.py
+++ b/packages/astrbot/main.py
@@ -566,7 +566,7 @@ UID: {user_id} 此 ID 可用于设置管理员。/op <UID> 授权管理员, /deo
     async def switch_conv(self, message: AstrMessageEvent, index: int = None):
         '''通过 /ls 前面的序号切换对话'''
 
-        if not isinstance(index,int):
+        if not isinstance(index, int):
             message.set_result(MessageEventResult().message("类型错误，请输入数字对话序号。"))
             return