.

generic/views.py

@@ -3818,8 +3818,13 @@ class UpdateQuestionMixin(RedirectMixin, RevisionMixin, UpdateView):
 def supervisor_overview(request, pk):
     supervisor = get_object_or_404(Supervisor, pk=pk)
 
-    if not request.user.supervisor == supervisor and not request.user.is_superuser:
+    if not request.user.is_superuser:
+        try:
+            if not request.user.supervisor == supervisor:
                 raise PermissionDenied()
+        except Supervisor.RelatedObjectDoesNotExist:
+                raise PermissionDenied()
+
 
     trainees = User.objects.filter(userprofile__supervisor=supervisor)
 
@@ -3833,7 +3838,11 @@ def supervisor_overview(request, pk):
 def supervisor_trainee(request, pk, trainee_id):
     supervisor = get_object_or_404(Supervisor, pk=pk)
 
-    if not request.user.supervisor == supervisor and not request.user.is_superuser:
+    if not request.user.is_superuser:
+        try:
+            if not request.user.supervisor == supervisor:
+                raise PermissionDenied()
+        except Supervisor.RelatedObjectDoesNotExist:
                 raise PermissionDenied()
 
     # We do this to check that the supervisor can (should) see the trainee results