diff --git a/mo/web/org_certs.py b/mo/web/org_certs.py
index 18ab59c13704ffd8827374badab01f1287030c92..5ee6dd6592e533598ff3b45327470dbb27b4b2ba 100644
--- a/mo/web/org_certs.py
+++ b/mo/web/org_certs.py
@@ -80,7 +80,7 @@ class CertSetForm(FlaskForm):
     delete = wtforms.SubmitField("Smazat diplomy")
 
     def osmo_validate(self, cset) -> bool:
-        if self.delete.data:
+        if (delete := getattr(self, 'delete')) is not None and delete.data:
             return True
 
         ok = True