Error - Invalid Key: The GraphQL Query at the Field at Route:X

Invalid key: The GraphQL query at the field at `Route:86842a74-fd68-4fcc-a9ad-2071a1b53714.slug` has a selection set, but no key could be generated for the data at this field.
You have to request `id` or `_id` fields for all selection sets or create a custom `keys` config for `Slug`.
Entities without keys will be embedded directly on the parent entity. If this is intentional, create a `keys` config for `Slug` that always returns null.