diff --git a/src/azul/plugins/repository/tdr_anvil/__init__.py b/src/azul/plugins/repository/tdr_anvil/__init__.py
index e5564fcce..ae69b5463 100644
--- a/src/azul/plugins/repository/tdr_anvil/__init__.py
+++ b/src/azul/plugins/repository/tdr_anvil/__init__.py
@@ -17,6 +17,7 @@
 import uuid
 
 import attrs
+from docutils.nodes import description
 from more_itertools import (
     one,
 )
@@ -457,8 +458,12 @@ def _supplementary_bundle(self, bundle_fqid: TDRAnvilBundleFQID) -> TDRAnvilBund
     def _duos_bundle(self, bundle_fqid: TDRAnvilBundleFQID) -> TDRAnvilBundle:
         assert not bundle_fqid.is_batched, bundle_fqid
         duos_info = self.tdr.get_duos(bundle_fqid.source)
-        duos_id = None if duos_info is None else one(duos_info['consentGroups'])['datasetIdentifier']
-        description = None if duos_info is None else duos_info.get('studyDescription')
+        if duos_info is None:
+            duos_id = None
+            description = None
+        else:
+            duos_id = one(duos_info['consentGroups'])['datasetIdentifier']
+            description = duos_info.get('studyDescription')
         ref, row = self._get_dataset(bundle_fqid.source.spec)
         expected_entity_id = change_version(bundle_fqid.uuid,
                                             self.bundle_uuid_version,