sib-ac-checker not working when only one permission

If I access the following object :

{
  "@id": "http://127.0.0.1:8000/api/actiongroups/1/",
  "name": "Test permissions",
  "permissions": [{ "mode": { "@type": "view" } }],
  "@context": "https://cdn.happy-dev.fr/owl/hdcontext.jsonld"
}

I get :

TypeError: this.resource['@permissions'] is not iterable

It seems to happen when I have only one permission.