diff --git a/boards/models.py b/boards/models.py
--- a/boards/models.py
+++ b/boards/models.py
@@ -76,11 +76,8 @@ class PostManager(models.Manager):
         if tag:
             threads = tag.threads
 
-            # TODO This needs to be uncommented when 'all tags' view won't
-            # use this method to get threads for tag
-
-            # if threads.count() == 0:
-            #     raise Http404
+            if threads.count() == 0:
+                raise Http404
         else:
             threads = self.filter(thread=None)
 
diff --git a/boards/tests.py b/boards/tests.py
--- a/boards/tests.py
+++ b/boards/tests.py
@@ -28,7 +28,7 @@ class BoardTests(TestCase):
         post = self._create_post()
 
         self.assertIsNotNone(post)
-        self.assertEqual(boards.models.NO_PARENT, post.parent)
+        self.assertIsNone(post.thread, 'Opening post has a thread')
 
     def test_delete_post(self):
         post = self._create_post()
@@ -52,7 +52,7 @@ class BoardTests(TestCase):
         opening_post = self._create_post()
 
         for i in range(0, 2):
-            Post.objects.create_post('title', 'text',thread=opening_post)
+            Post.objects.create_post('title', 'text', thread=opening_post)
 
         thread = Post.objects.get_thread(opening_post.id)
 
diff --git a/boards/views.py b/boards/views.py
--- a/boards/views.py
+++ b/boards/views.py
@@ -337,8 +337,7 @@ def _get_user(request):
 
         time_now = timezone.now()
         user = User.objects.create(user_id=new_id, rank=RANK_USER,
-                                   registration_time=time_now,
-                                   last_access_time=time_now)
+                                   registration_time=time_now)
 
         session['user_id'] = user.id
     else: