ansible when statement error

---
- hosts: all
  gather_facts: no
  vars:
    XQWATCHER_GIT_IDENTITY: !!null

  tasks:
    - debug:
        msg: "Test Success"
      when: XQWATCHER_GIT_IDENTITY is defined

Getting this error when I run the playbook

ansible-playbook -i "localhost," test.yml -c local

PLAY [all] *********************************************************************

TASK [debug] *******************************************************************
fatal: [localhost]: FAILED! => {"failed": true, "msg": "The conditional check 'XQWATCHER_GIT_IDENTITY' failed. The error was: error while evaluating conditional (XQWATCHER_GIT_IDENTITY): 'abc' is undefined\n\nThe error appears to have been in '/Users/arbab/test-ansible/test.yml': line 8, column 7, but may\nbe elsewhere in the file depending on the exact syntax problem.\n\nThe offending line appears to be:\n\n  tasks:\n    - debug:\n      ^ here\n"}

sorry about the error, here is the error:

fatal: [localhost]: FAILED! => {“failed”: true, “msg”: “The conditional check ‘"XQWATCHER_GIT_IDENTITY" id defined’ failed. The error was: template error while templating string: expected token ‘end of statement block’, got ‘id’. String: {% if "XQWATCHER_GIT_IDENTITY" id defined %} True {% else %} False {% endif %}\n\nThe error appears to have been in ‘/Users/arbab/test-ansible/test.yml’: line 8, column 7, but may\nbe elsewhere in the file depending on the exact syntax problem.\n\nThe offending line appears to be:\n\n tasks:\n - debug:\n ^ here\n”}

you error has ‘{% if "XQWATCHER_GIT_IDENTITY" id defined %}’, which seems to indicate you misspelled ‘is’ as ‘id’.