diff --git a/example/backends/spidsaml2_validator.py b/example/backends/spidsaml2_validator.py
index 9311e9be..15e272a3 100644
--- a/example/backends/spidsaml2_validator.py
+++ b/example/backends/spidsaml2_validator.py
@@ -78,7 +78,7 @@ def validate_issuer(self):
         # 30
         # check that this issuer is in the metadata...
         # L'attributo Format di Issuer della Response deve essere omesso o assumere valore urn:oasis:names:tc:SAML:2.0:nameid-format:entity. In questo test il valore è diverso. Risultato atteso: KO
-        if hasattr(self.response.issuer.format):
+        if hasattr(self.response.issuer, "format"):
             if (
                 self.response.issuer.format
                 != "urn:oasis:names:tc:SAML:2.0:nameid-format:entity"