diff --git a/src/VirtoCommerce.Xapi.Data/Security/OpenIddict/ContactSignInValidator.cs b/src/VirtoCommerce.Xapi.Data/Security/OpenIddict/ContactSignInValidator.cs
index 9791031..ea7224f 100644
--- a/src/VirtoCommerce.Xapi.Data/Security/OpenIddict/ContactSignInValidator.cs
+++ b/src/VirtoCommerce.Xapi.Data/Security/OpenIddict/ContactSignInValidator.cs
@@ -91,7 +91,7 @@ private Task<Store> GetStore(TokenRequestContext context)
             var storeId = context.Request.GetParameter(ModuleConstants.Parameters.StoreId)?.Value?.ToString();
 
             return string.IsNullOrEmpty(storeId)
-                ? null
+                ? Task.FromResult<Store>(null)
                 : _storeService.GetNoCloneAsync(storeId);
         }