diff --git a/swh/indexer/metadata.py b/swh/indexer/metadata.py
--- a/swh/indexer/metadata.py
+++ b/swh/indexer/metadata.py
@@ -76,7 +76,10 @@
                 .translate(data)
         except Exception:
             self.log.exception(
-                "Problem during tool retrieval of metadata translation")
+                "Problem during metadata translation "
+                "for content %s" % hashutil.hash_to_hex(id))
+        if result['translated_metadata'] is None:
+            return None
         return result
 
     def persist_index_computations(self, results, policy_update):
diff --git a/swh/indexer/tests/test_metadata.py b/swh/indexer/tests/test_metadata.py
--- a/swh/indexer/tests/test_metadata.py
+++ b/swh/indexer/tests/test_metadata.py
@@ -240,9 +240,6 @@
                 'url': 'https://docs.npmjs.com/'
             },
             'id': hash_to_bytes('d4c647f0fc257591cc9ba1722484229780d1c607')
-            }, {
-            'translated_metadata': None,
-            'id': hash_to_bytes('02fb2c89e14f7fab46701478c83779c7beb7b069')
         }]
 
         for result in results: