diff --git plugins/kubernetes_linux/backup.py plugins/kubernetes_linux/backup.py
index 365cd1718b4..1046a64c2a5 100644
--- plugins/kubernetes_linux/backup.py
+++ plugins/kubernetes_linux/backup.py
@@ -62,7 +62,7 @@ def backup_chart_releases(self, job, backup_name):
                 ]
             )
             # We ignore this keeping in line with helm behaviour where the secret malformed is ignored by helm
-            for secret in sorted(secrets, key=lambda d: d['metadata']['name'] and d.get('data')):
+            for secret in sorted(filter(lambda d: d.get('data'), secrets), key=lambda d: d['metadata']['name']):
                 with open(os.path.join(secrets_dir, secret['metadata']['name']), 'w') as f:
                     f.write(self.middleware.call_sync('k8s.secret.export_to_yaml_internal', secret))