diff --git a/quetz/database.py b/quetz/database.py
index 1720728a..71492735 100644
--- a/quetz/database.py
+++ b/quetz/database.py
@@ -104,7 +104,8 @@ def sanitize_db_url(db_url: str) -> str:
     # Attempt 1: Actual parsing, this is ideal but may fail
     try:
         parsed_url = make_url(db_url)
-        return db_url.replace(parsed_url.password, "***")
+        if parsed_url.password:
+            return db_url.replace(parsed_url.password, "***")
     except ArgumentError:
         pass
 
diff --git a/quetz/tests/test_database.py b/quetz/tests/test_database.py
index f66b6daa..3c7be928 100644
--- a/quetz/tests/test_database.py
+++ b/quetz/tests/test_database.py
@@ -15,6 +15,7 @@
             "postgresql+psycopg2://postgres_user:***@localhost:5432/postgres",
         ),
         ("A:B@C:1111/DB", "A:***@C:1111/DB"),
+        ("THISISNOTAURL", "THISISNOTAURL"),
     ),
 )
 def test_sanitize_db_url(input_url, expected_output_url):