diff --git a/CHANGELOG.md b/CHANGELOG.md
index d5f0a410..85a0b47f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,7 @@
 #### Fixes
 
 - Fixed logging problem related to django translation before logging ([#624](https://github.com/jazzband/django-auditlog/pull/624))
+- Fixed manuall logging when model is not registered ([#627](https://github.com/jazzband/django-auditlog/pull/627))
 
 ## 3.0.0-beta.4 (2024-01-02)
 
diff --git a/auditlog/models.py b/auditlog/models.py
index c28cb1bc..43d2baa9 100644
--- a/auditlog/models.py
+++ b/auditlog/models.py
@@ -224,6 +224,9 @@ def _get_pk_value(self, instance):
     def _get_serialized_data_or_none(self, instance):
         from auditlog.registry import auditlog
 
+        if not auditlog.contains(instance.__class__):
+            return None
+
         opts = auditlog.get_serialize_options(instance.__class__)
         if not opts["serialize_data"]:
             return None
diff --git a/auditlog_tests/tests.py b/auditlog_tests/tests.py
index b04077e7..627324f4 100644
--- a/auditlog_tests/tests.py
+++ b/auditlog_tests/tests.py
@@ -1112,6 +1112,21 @@ def test_unregister_delete(self):
         # Check for log entries
         self.assertEqual(LogEntry.objects.count(), 0, msg="There are no log entries")
 
+    def test_manual_logging(self):
+        obj = self.obj
+        obj.boolean = True
+        obj.save()
+        LogEntry.objects.log_create(
+            instance=obj,
+            action=LogEntry.Action.UPDATE,
+            changes="",
+        )
+        self.assertEqual(
+            obj.history.filter(action=LogEntry.Action.UPDATE).count(),
+            1,
+            msg="There is one log entry for 'UPDATE'",
+        )
+
 
 class RegisterModelSettingsTest(TestCase):
     def setUp(self):