diff --git a/cirro_api_client/v1/models/sample.py b/cirro_api_client/v1/models/sample.py
index 741910a..e070ea4 100644
--- a/cirro_api_client/v1/models/sample.py
+++ b/cirro_api_client/v1/models/sample.py
@@ -73,9 +73,9 @@ def from_dict(cls: Type[T], src_dict: Dict[str, Any]) -> T:
 
         dataset_ids = cast(List[str], d.pop("datasetIds"))
 
-        created_at = isoparse(d.pop("createdAt"))
+        created_at = (isoparse(d.pop("createdAt")) if d["createdAt"] else None)
 
-        updated_at = isoparse(d.pop("updatedAt"))
+        updated_at = (isoparse(d.pop("updatedAt")) if d["updatedAt"] else None)
 
         sample = cls(
             id=id,