diff --git a/crypto_condor/primitives/common.py b/crypto_condor/primitives/common.py
index b520eb0..2652035 100644
--- a/crypto_condor/primitives/common.py
+++ b/crypto_condor/primitives/common.py
@@ -690,7 +690,7 @@ def print_results(self, res: Results | ResultsDict) -> None:
     def process_results(
         self,
         res: ResultsDict | Results,
-        filename: str = "",
+        filename: str | None = "",
         no_save: bool = False,
         debug_data: bool | None = None,
     ) -> bool:
@@ -769,7 +769,7 @@ def process_results(
             subtitle=f"crypto-condor {padded_version} by Quarkslab",
         )
         self.print(summary)
-        if no_save:
+        if no_save or filename is None:
             # Nothing more to do.
             return res.check()
         # Save results.
diff --git a/tests/primitives/test_common.py b/tests/primitives/test_common.py
new file mode 100644
index 0000000..6ce3ff2
--- /dev/null
+++ b/tests/primitives/test_common.py
@@ -0,0 +1,20 @@
+"""Module to test crypto_condor.primitives.common."""
+
+from hashlib import sha256
+from pathlib import Path
+
+from crypto_condor.primitives import SHA
+from crypto_condor.primitives.common import Console
+
+
+class TestConsole:
+    """Tests for the Console class."""
+
+    def test_filename_none(self, tmp_path: Path):
+        """Tests passing None as filename.
+
+        The expected behaviour is that the user is not prompted for a filename.
+        """
+        rd = SHA.test(lambda msg: sha256(msg).digest(), SHA.Algorithm.SHA_256)
+        console = Console()
+        assert console.process_results(rd, None)