diff --git a/tasks/internal/ca_minimal.yml b/tasks/internal/ca_minimal.yml
index 09b9396..1187147 100644
--- a/tasks/internal/ca_minimal.yml
+++ b/tasks/internal/ca_minimal.yml
@@ -6,7 +6,7 @@
   ansible.builtin.assert:
     that:
       - config_ca.ca.key_size in CERT_HC.options.key_size.ca
-      - config_ca.ca.email | default(none, true) or config_ca.ca.email | validate_email
+      - config_ca.ca.email | default(none, true) is none or config_ca.ca.email | validate_email
 
 - name: Certificates | Internal | Minimal CA | Creating ca directory
   ansible.builtin.file: