Ho messo un attribute error che non era vero

admin_interface/models.py

@@ -83,7 +83,7 @@ class Theme(models.Model):
 
             try:
                 return user_theme_manager.filter(user=user, theme__active=True).first().theme
-            except AttributeError as e:
+            except:
                 obj = objs_active_ls[-1]
                 obj.set_active()