diff --git a/registration/models.py b/registration/models.py
index 8705944..b732c72 100644
--- a/registration/models.py
+++ b/registration/models.py
@@ -281,7 +281,10 @@ def delete_expired_users(self):
                     user = profile.user
                     logger.warning('Deleting expired Registration profile {} and user {}.'.format(profile, user))
                     profile.delete()
-                    user.delete()
+                    try:
+                        user.delete()
+                    except (models.ProtectedError, models.RestrictedError) as e:
+                        logger.error('Deletion of user {} is prevented: {}'.format(user, e))
                     deleted_count += 1
             except UserModel().DoesNotExist:
                 logger.warning('Deleting expired Registration profile {}'.format(profile))