diff --git a/access/views.py b/access/views.py
index d11a83f..0f908c5 100644
--- a/access/views.py
+++ b/access/views.py
@@ -153,7 +153,7 @@ class DetailUserView(APIView):
             try:
                 acc['b_day'] = datetime.datetime.strptime(acc['b_day'], '%Y.%m.%d')
             except ValueError:
-                pass
+                acc['b_day'] = None
 
         acc['gender'] = 0 if acc['gender'] == "undefined" else 1 if acc['gender'] == "male" else 2
 
diff --git a/lms/settings.py b/lms/settings.py
index 6f326f9..92db76a 100644
--- a/lms/settings.py
+++ b/lms/settings.py
@@ -122,7 +122,7 @@ MIDDLEWARE_CLASSES = [
     'django.middleware.clickjacking.XFrameOptionsMiddleware',
     #'access.middleware.CheckPerm',
     'access.middleware.RequestToApi',
-    # 'access.middleware.UpdateActivity',
+    'access.middleware.UpdateActivity',
 ]
 
 REST_FRAMEWORK = {