diff --git a/roles/role_configure_ovh_instance/tasks/main.yml b/roles/role_configure_ovh_instance/tasks/main.yml
index ab49fe0..482581d 100644
--- a/roles/role_configure_ovh_instance/tasks/main.yml
+++ b/roles/role_configure_ovh_instance/tasks/main.yml
@@ -24,7 +24,9 @@
 
 - name: reboot
   ansible.builtin.reboot:
-  when: upgrade_register is changed
+  when:
+    - upgrade_register is defined
+    - upgrade_register is changed
   become: true
 
 - name: enable EPEL