diff --git a/django_lifecycle/mixins.py b/django_lifecycle/mixins.py
index 3b5b6b6..b205535 100644
--- a/django_lifecycle/mixins.py
+++ b/django_lifecycle/mixins.py
@@ -267,7 +267,7 @@ def _get_model_descriptor_names(cls) -> List[str]:
         for name in dir(cls):
             attr = getattr(cls, name, None)
 
-            if attr and isinstance(attr, DJANGO_RELATED_FIELD_DESCRIPTOR_CLASSES):
+            if isinstance(attr, DJANGO_RELATED_FIELD_DESCRIPTOR_CLASSES):
                 descriptor_names.append(name)
 
         return descriptor_names