diff --git a/swh/indexer/metadata_dictionary/utils.py b/swh/indexer/metadata_dictionary/utils.py
--- a/swh/indexer/metadata_dictionary/utils.py
+++ b/swh/indexer/metadata_dictionary/utils.py
@@ -107,6 +107,10 @@
     """
     if not isinstance(url, str):
         return
-    if " " in url or not urllib.parse.urlparse(url).netloc:
+    try:
+        parsed_url = urllib.parse.urlparse(url)
+    except Exception:
+        return
+    if " " in url or not parsed_url.netloc:
         return
     graph.add((subject, predicate, rdflib.term.URIRef(url)))
diff --git a/swh/indexer/tests/metadata_dictionary/test_npm.py b/swh/indexer/tests/metadata_dictionary/test_npm.py
--- a/swh/indexer/tests/metadata_dictionary/test_npm.py
+++ b/swh/indexer/tests/metadata_dictionary/test_npm.py
@@ -389,6 +389,17 @@
         "version": "1.0.0",
     }
 
+    package_json = rb"""{
+  "version": "1.0.0",
+  "repository": "git+http://\\u001b[D\\u001b[D\\u001b[Ds\\u001b[C\\u001b[C\\u001b[D\\u001b://github.com/dearzoe/array-combination"
+}"""  # noqa
+    result = MAPPINGS["NpmMapping"]().translate(package_json)
+    assert result == {
+        "@context": "https://doi.org/10.5063/schema/codemeta-2.0",
+        "type": "SoftwareSourceCode",
+        "version": "1.0.0",
+    }
+
 
 def test_npm_invalid_licenses():
     package_json = rb"""{