diff --git a/DatabaseImplement/Implements/RoleStorage.cs b/DatabaseImplement/Implements/RoleStorage.cs
index a1d8e63..390848b 100644
--- a/DatabaseImplement/Implements/RoleStorage.cs
+++ b/DatabaseImplement/Implements/RoleStorage.cs
@@ -32,7 +32,7 @@ namespace DatabaseImplement.Implements
 
         public RoleBindingModel? GetElement(RoleSearchModel model)
         {
-            if (model.Id is null && string.IsNullOrWhiteSpace(model.Name))
+            if (model.Id is null && string.IsNullOrWhiteSpace(model?.Name))
             {
                 return null;
             }
@@ -46,7 +46,7 @@ namespace DatabaseImplement.Implements
         public IEnumerable<RoleBindingModel> GetList(RoleSearchModel? model)
         {
             var context = new Database();
-            if (model is null && string.IsNullOrWhiteSpace(model.Name))
+            if (model is null && string.IsNullOrWhiteSpace(model?.Name))
             {
                 return context.Roles.Select(r => r.GetBindingModel());
             }