Double check _requestLocalizationOptions

framework/src/Volo.Abp.AspNetCore/Microsoft/AspNetCore/RequestLocalization/DefaultAbpRequestLocalizationOptionsProvider.cs

@@ -49,6 +49,8 @@ namespace Microsoft.AspNetCore.RequestLocalization
             if (_requestLocalizationOptions == null)
             {
                 using (await _syncSemaphore.LockAsync())
+                {
+                    if (_requestLocalizationOptions == null)
                     {
                         using (var serviceScope = _serviceProviderFactory.CreateScope())
                         {
@@ -82,6 +84,7 @@ namespace Microsoft.AspNetCore.RequestLocalization
                         }
                     }
                 }
+            }
 
             return _requestLocalizationOptions;
         }