diff --git a/swh/indexer/metadata_dictionary/base.py b/swh/indexer/metadata_dictionary/base.py
index e992bb521468ed8482e22593abcfbf7493a958f3..e8fd8c2ea1c534e2c34ca862623aea542298c36b 100644
--- a/swh/indexer/metadata_dictionary/base.py
+++ b/swh/indexer/metadata_dictionary/base.py
@@ -400,7 +400,7 @@ class YamlMapping(DictMapping):
         raw_content_string: str = raw_content.decode()
         try:
             content_dict = yaml.load(raw_content_string, Loader=SafeLoader)
-        except (yaml.scanner.ScannerError, yaml.parser.ParserError):
+        except yaml.YAMLError:
             return None
 
         if isinstance(content_dict, dict):
diff --git a/swh/indexer/tests/metadata_dictionary/test_dart.py b/swh/indexer/tests/metadata_dictionary/test_dart.py
index 9dad26379bc5a8801ff9b15db4d836282f548269..0528615fedc9c4421df5d89b20f3d569eb0349a9 100644
--- a/swh/indexer/tests/metadata_dictionary/test_dart.py
+++ b/swh/indexer/tests/metadata_dictionary/test_dart.py
@@ -159,3 +159,14 @@ def test_invalid_yaml():
     result = MAPPINGS["PubMapping"]().translate(raw_content)
 
     assert result is None
+
+
+def test_invalid_tag():
+    raw_content = b"""
+    name: translatron
+    description: !BETA VERSION - NOT FOR LIVE OR PROD USAGE!
+    """
+
+    result = MAPPINGS["PubMapping"]().translate(raw_content)
+
+    assert result is None