diff --git a/DigitalLearningSolutions.Web/Controllers/LearningPortalController/SelfAssessment.cs b/DigitalLearningSolutions.Web/Controllers/LearningPortalController/SelfAssessment.cs
index 94b005f1e6..159f2ab034 100644
--- a/DigitalLearningSolutions.Web/Controllers/LearningPortalController/SelfAssessment.cs
+++ b/DigitalLearningSolutions.Web/Controllers/LearningPortalController/SelfAssessment.cs
@@ -510,7 +510,7 @@ public IActionResult StartAddNewSupervisor(int selfAssessmentId)
         [Route("/LearningPortal/SelfAssessment/{selfAssessmentId:int}/Supervisors/Add")]
         public IActionResult AddNewSupervisor(int selfAssessmentId)
         {
-            if(TempData[MultiPageFormDataFeature.AddNewSupervisor] == null)
+            if(TempData[MultiPageFormDataFeature.AddNewSupervisor.TempDataKey] == null)
             {
                 return RedirectToAction("StatusCode", "LearningSolutions", new { code = (int)HttpStatusCode.Forbidden });
             }