diff --git a/src/caselawclient/models/neutral_citation_mixin.py b/src/caselawclient/models/neutral_citation_mixin.py
index 99e2976d..ac76ea4f 100644
--- a/src/caselawclient/models/neutral_citation_mixin.py
+++ b/src/caselawclient/models/neutral_citation_mixin.py
@@ -40,4 +40,7 @@ def neutral_citation(self) -> Optional[NeutralCitationString]: ...
     @cached_property
     @deprecated("Legacy usage of NCNs is deprecated; you should be moving to the Identifiers framework")
     def has_valid_ncn(self) -> bool:
-        return self.neutral_citation is not None and neutral_url(self.neutral_citation) is not None
+        """Return `False` if the document has an NCN and it's invalid, otherwise return `True`."""
+        if not self.neutral_citation:
+            return True
+        return bool(neutral_url(self.neutral_citation))
diff --git a/tests/models/test_judgments.py b/tests/models/test_judgments.py
index 12c49658..d9962d6b 100644
--- a/tests/models/test_judgments.py
+++ b/tests/models/test_judgments.py
@@ -53,7 +53,7 @@ def test_judgment_neutral_citation(self, mock_api_client):
             ("[2022] UKFTT 1 (TC)", True),
             ("[2022] UKFTT 1 (GRC)", True),
             ("[2022] EWHC 1 (KB)", True),
-            ("", False),
+            ("", True),  # An empty NCN should return True
             ("1604] EWCA Crim 555", False),
             ("[2022 EWHC 1 Comm", False),
             ("[1999] EWCOP", False),
diff --git a/tests/models/test_press_summaries.py b/tests/models/test_press_summaries.py
index 7a2df75d..0c7e49ed 100644
--- a/tests/models/test_press_summaries.py
+++ b/tests/models/test_press_summaries.py
@@ -59,7 +59,7 @@ def test_press_summary_neutral_citation(self, mock_api_client):
             ("[2022] UKFTT 1 (TC)", True),
             ("[2022] UKFTT 1 (GRC)", True),
             ("[2022] EWHC 1 (KB)", True),
-            ("", False),
+            ("", True),  # An empty NCN should return True
             ("1604] EWCA Crim 555", False),
             ("[2022 EWHC 1 Comm", False),
             ("[1999] EWCOP", False),