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;