extensions/views/mixins.py

@@ -37,7 +37,7 @@ class MaintainedExtensionMixin:
         if user_teams:
             filter = filter | Q(team__in=[t.pk for t in user_teams])
         self.extension = get_object_or_404(
-            Extension.objects.filter(filter),
+            Extension.objects.filter(filter).distinct(),
             slug=self.kwargs['slug'],
         )
         return super().dispatch(*args, **kwargs)