diff --git a/AsbCloudInfrastructure/Services/Cache/CacheTable.cs b/AsbCloudInfrastructure/Services/Cache/CacheTable.cs
index e2f9e4ba..2fefe662 100644
--- a/AsbCloudInfrastructure/Services/Cache/CacheTable.cs
+++ b/AsbCloudInfrastructure/Services/Cache/CacheTable.cs
@@ -24,7 +24,8 @@ namespace AsbCloudInfrastructure.Services.Cache
 
         public int Refresh()
         {
-            cached.Clear();
+            if(cached.Any())
+                cached.Clear();
             var dbEntities = context.Set<TEntity>().ToList();
             cached.AddRange(dbEntities);
             data.refreshDate = DateTime.Now;
@@ -33,7 +34,8 @@ namespace AsbCloudInfrastructure.Services.Cache
 
         public async Task<int> RefreshAsync(CancellationToken token = default)
         {
-            cached.Clear();
+            if (cached.Any())
+                cached.Clear();
             var dbEntities = await context.Set<TEntity>().ToListAsync(token).ConfigureAwait(false);
             cached.AddRange(dbEntities);
             data.refreshDate = DateTime.Now;