diff --git a/SimpleRedis/Redis/SimpleRedis.cs b/SimpleRedis/Redis/SimpleRedis.cs
index 89fb27f0614e98aad88e7c6b91b7a8426c3796aa..7623befeb83ed30092c65ed208c6c235ff610c9c 100644
--- a/SimpleRedis/Redis/SimpleRedis.cs
+++ b/SimpleRedis/Redis/SimpleRedis.cs
@@ -1,4 +1,4 @@
-using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.Configuration;
 using NewLife.Caching;
 using NewLife.Caching.Models;
 using SimpleRedis;
@@ -131,7 +131,7 @@ namespace SimpleRedis
                 return 0;
             //pattern = Regex.Replace(pattern, @"\{*.\}", "(.*)");
             //var keys = fullRedis.Search(new SearchModel { Pattern = pattern });
-            var keys = redisConnection.Keys.Where(k => k.StartsWith(pattern));
+            var keys = redisConnection.Keys?.Where(k => k.StartsWith(pattern));
             //var keys = GetAllKeys().Where(k => k.StartsWith(pattern));
             if (keys != null && keys.Any())
                 return redisConnection.Remove(keys.ToArray());