how to control the execution of rescue module in ansible

user_8545903 0
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I have a playbook like this below ,i want to control execution of rescue when the block goes wrong。 I add when: is_debug is defined after rescue ，but when i run ansible-playbook dashboard.yml ,not give the is_debug value, the rescue is still excute when block has error .

i want know how to control the execution of rescue module in ansible ?

[root@ansiable-test update]# cat dashboard.yml
---
- hosts: controller
  vars_files:
        - "vars/vars.yml"
  tasks:
    - name: update horizon
    - block:
        - include: "roles/dashboard/tasks/update-horizon.yml"
      rescue:
      when: is_debug is defined
        - debug: msg='An error occurred during the upgrade,roll back to the old version'
        - include: "roles/dashboard/tasks/rollback.yml"
ansible
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