diff --git a/server/AyaNova/models/DataListTableProcessingOptions.cs b/server/AyaNova/models/DataListTableProcessingOptions.cs
index c5bcb5b7..822302cf 100644
--- a/server/AyaNova/models/DataListTableProcessingOptions.cs
+++ b/server/AyaNova/models/DataListTableProcessingOptions.cs
@@ -25,6 +25,7 @@ namespace AyaNova.Models
             long userId,
             AuthorizationRoles userRoles)
         {
+            HiddenAffectiveColumns=new List<string>();
             //set some values from request
             Limit = request.Limit;
             Offset = request.Offset;