diff --git a/CHANGELOG.md b/CHANGELOG.md
index fead883..8923781 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,10 @@
 - Add `AUDITLOG_USE_BASE_MANAGER` setting to override default manager use ([#766](https://github.com/jazzband/django-auditlog/pull/766))
 - Drop 'Python 3.9' support ([#773](https://github.com/jazzband/django-auditlog/pull/773))
 
+#### Fixes
+
+- Make diffing more robust for polymorphic models ([#784](https://github.com/jazzband/django-auditlog/pull/784))
+
 ## 3.3.0 (2025-09-18)
 
 #### Improvements
diff --git a/auditlog/diff.py b/auditlog/diff.py
index 0d69749..dd64d20 100644
--- a/auditlog/diff.py
+++ b/auditlog/diff.py
@@ -3,7 +3,7 @@ from collections.abc import Callable
 from datetime import timezone
 
 from django.conf import settings
-from django.core.exceptions import ObjectDoesNotExist
+from django.core.exceptions import FieldDoesNotExist, ObjectDoesNotExist
 from django.db.models import NOT_PROVIDED, DateTimeField, ForeignKey, JSONField, Model
 from django.utils import timezone as django_timezone
 from django.utils.encoding import smart_str
@@ -74,7 +74,7 @@ def get_field_value(obj, field, use_json_for_changes=False):
         try:
             model_field = obj._meta.get_field(field.name)
             default = model_field.default
-        except AttributeError:
+        except (AttributeError, FieldDoesNotExist):
             default = NOT_PROVIDED
 
         if default is NOT_PROVIDED: