diff --git a/src/postorius/views/list.py b/src/postorius/views/list.py
index 2936ed2..cd5ae88 100644
--- a/src/postorius/views/list.py
+++ b/src/postorius/views/list.py
@@ -140,6 +140,8 @@
     try:
         mm_member = client.get_member(list_id, email)
         member_prefs = mm_member.preferences
+    except ValueError:
+        raise Http404(_('Member does not exist'))
     except Mailman404Error:
         return render(request, template_name, {'nolists': 'true'})
     initial_moderation = dict([