Fixed thread creation when subscribe option is enabled

boards/models/post/manager.py

@@ -232,7 +232,7 b' class PostManager(models.Manager):'
             from boards.abstracts.settingsmanager import get_settings_manager
             settings_manager = get_settings_manager(request)
             settings_manager.add_or_read_fav_thread(
-                post_thread.get_opening_post())
+                post.get_thread().get_opening_post())
 
         if html_response:
             return redirect(post.get_absolute_url())