diff --git a/DigitalLearningSolutions.Web/ViewModels/Supervisor/SupervisorDelegateViewModel.cs b/DigitalLearningSolutions.Web/ViewModels/Supervisor/SupervisorDelegateViewModel.cs
index 53fd39ee54..4c157a0d86 100644
--- a/DigitalLearningSolutions.Web/ViewModels/Supervisor/SupervisorDelegateViewModel.cs
+++ b/DigitalLearningSolutions.Web/ViewModels/Supervisor/SupervisorDelegateViewModel.cs
@@ -47,6 +47,6 @@ public SupervisorDelegateViewModel() { }
         [DefaultValue(false)]
         public bool ConfirmedRemove { get; set; }
         public int SelfAssessmentCategory { get; set; }
-        public IEnumerable<SelectListItem> SelfAssessmentCategories { get; set; }
+        public IEnumerable<SelectListItem>? SelfAssessmentCategories { get; set; }
     }
 }