diff --git a/swh/indexer/metadata_dictionary/codemeta.py b/swh/indexer/metadata_dictionary/codemeta.py
index 1fc613f74a6c0345179f0aee72c0ecd0b7957ac8..0da51b8bb0d59650baadcc1c8ffb3c3c49fddcaf 100644
--- a/swh/indexer/metadata_dictionary/codemeta.py
+++ b/swh/indexer/metadata_dictionary/codemeta.py
@@ -1,4 +1,4 @@
-# Copyright (C) 2018-2022  The Software Heritage developers
+# Copyright (C) 2018-2024  The Software Heritage developers
 # See the AUTHORS file at the top-level directory of this distribution
 # License: GNU General Public License version 3, or any later version
 # See top-level LICENSE file for more information
@@ -146,21 +146,25 @@ class SwordCodemetaMapping(BaseExtrinsicMapping):
 
     def translate(self, content: bytes) -> Optional[Dict[str, Any]]:
         # Parse XML
-        root = ET.fromstring(content)
-
-        # Transform to JSON-LD document
-        doc = self.xml_to_jsonld(root)
+        try:
+            root = ET.fromstring(content)
+        except ET.ParseError:
+            logger.error("Failed to parse XML document: %s", content)
+            return None
+        else:
+            # Transform to JSON-LD document
+            doc = self.xml_to_jsonld(root)
 
-        assert isinstance(doc, dict), f"Root object is not a dict: {doc}"
+            assert isinstance(doc, dict), f"Root object is not a dict: {doc}"
 
-        # Add @context to JSON-LD expansion replaces the "codemeta:" prefix
-        # hash (which uses the context URL as namespace URI for historical
-        # reasons) into properties in `http://schema.org/` and
-        # `https://codemeta.github.io/terms/` namespaces
-        doc["@context"] = CODEMETA_CONTEXT_URL
+            # Add @context to JSON-LD expansion replaces the "codemeta:" prefix
+            # hash (which uses the context URL as namespace URI for historical
+            # reasons) into properties in `http://schema.org/` and
+            # `https://codemeta.github.io/terms/` namespaces
+            doc["@context"] = CODEMETA_CONTEXT_URL
 
-        # Normalize as a Codemeta document
-        return self.normalize_translation(expand(doc))
+            # Normalize as a Codemeta document
+            return self.normalize_translation(expand(doc))
 
     def normalize_translation(self, metadata: Dict[str, Any]) -> Dict[str, Any]:
         return compact(metadata, forgefed=False)
@@ -183,14 +187,18 @@ class JsonSwordCodemetaMapping(SwordCodemetaMapping):
         # ``content`` was generated by calling ``xmltodict.parse()`` on a XML document,
         # so ``xmltodict.unparse()`` is guaranteed to return a document that is
         # semantically equivalent to the original and pass it to SwordCodemetaMapping.
-        json_doc = json.loads(content)
-
-        if json_doc.get("@xmlns") != ATOM_URI:
-            # Technically, non-default XMLNS were allowed, but it does not seem like
-            # anyone used them, so they do not need to be implemented here.
-            raise NotImplementedError(f"Unexpected XMLNS set: {json_doc}")
+        try:
+            json_doc = json.loads(content)
+        except json.JSONDecodeError:
+            logger.error("Failed to parse JSON document: %s", content)
+            return None
+        else:
+            if json_doc.get("@xmlns") != ATOM_URI:
+                # Technically, non-default XMLNS were allowed, but it does not seem like
+                # anyone used them, so they do not need to be implemented here.
+                raise NotImplementedError(f"Unexpected XMLNS set: {json_doc}")
 
-        # Root tag was stripped by swh-deposit
-        json_doc = {"entry": json_doc}
+            # Root tag was stripped by swh-deposit
+            json_doc = {"entry": json_doc}
 
-        return super().translate(xmltodict.unparse(json_doc))
+            return super().translate(xmltodict.unparse(json_doc))
diff --git a/swh/indexer/tests/metadata_dictionary/test_codemeta.py b/swh/indexer/tests/metadata_dictionary/test_codemeta.py
index 6c9d6def061c33197d9d21f80b04e6cb24760dff..4240b50adbda81dcb58f54dcf6ab51459b75ba8b 100644
--- a/swh/indexer/tests/metadata_dictionary/test_codemeta.py
+++ b/swh/indexer/tests/metadata_dictionary/test_codemeta.py
@@ -1,9 +1,10 @@
-# Copyright (C) 2017-2022  The Software Heritage developers
+# Copyright (C) 2017-2024  The Software Heritage developers
 # See the AUTHORS file at the top-level directory of this distribution
 # License: GNU General Public License version 3, or any later version
 # See top-level LICENSE file for more information
 
 import json
+import logging
 
 from hypothesis import HealthCheck, given, settings
 import pytest
@@ -518,6 +519,12 @@ def test_sword_fix_date():
     }
 
 
+def test_sword_codemeta_parsing_error(caplog):
+    caplog.set_level(logging.ERROR)
+    assert MAPPINGS["SwordCodemetaMapping"]().translate(b"123") is None
+    assert caplog.text.endswith("Failed to parse XML document: b'123'\n")
+
+
 def test_json_sword():
     content = """{"id": "hal-01243573", "@xmlns": "http://www.w3.org/2005/Atom", "author": {"name": "Author 1", "email": "foo@example.org"}, "client": "hal", "codemeta:url": "http://example.org/", "codemeta:name": "The assignment problem", "@xmlns:codemeta": "https://doi.org/10.5063/SCHEMA/CODEMETA-2.0", "codemeta:author": {"codemeta:name": "Author 2"}, "codemeta:license": {"codemeta:name": "GNU General Public License v3.0 or later"}}"""  # noqa
     result = MAPPINGS["JsonSwordCodemetaMapping"]().translate(content)
@@ -532,3 +539,9 @@ def test_json_sword():
         "url": "http://example.org/",
         "name": "The assignment problem",
     }
+
+
+def test_json_sword_codemeta_parsing_error(caplog):
+    caplog.set_level(logging.ERROR)
+    assert MAPPINGS["JsonSwordCodemetaMapping"]().translate(b"{123}") is None
+    assert caplog.text.endswith("Failed to parse JSON document: b'{123}'\n")