Stoping an ECS instance returns error

[juniorh]

I'm trying to create, modify, start & stop an ECS instance by changing the state parameter of module ali_instance.

Operation create, modify, and start running without an issue but stopping the instance return error (even the instance is actually turning off).

# playbook.yaml
---
- hosts: localhost
  gather_facts: no
  tasks:
  - ali_instance:
      instance_name: vm-test
      host_name: vm-test
      instance_type: ecs.t5-lc1m1.small
      image: debian_10_10_uefi_x64_20G_alibase_20210611.vhd
      vswitch_id: vsw-xxxxxx
      security_groups: sg-xxxxxx
      allocate_public_ip: False
      state: stopped

Ansible & module version

$ ansible --version
ansible 2.10.8
  config file = None
  configured module search path = ['/root/.ansible/plugins/modules', '/usr/share/ansible/plugins/modules']
  ansible python module location = /usr/local/lib/python3.7/dist-packages/ansible
  executable location = /usr/local/bin/ansible
  python version = 3.7.3 (default, Jan 22 2021, 20:04:44) [GCC 8.3.0]

$ pip3 list |grep alicloud
ansible-alicloud              1.19.0
ansible-alicloud-module-utils 1.5.0

Error

fatal: [localhost]: FAILED! => {
    "changed": false,
    "invocation": {
        "module_args": {
            "alicloud_access_key": "VALUE_SPECIFIED_IN_NO_LOG_PARAMETER",
            "alicloud_assume_role": null,
            "alicloud_assume_role_arn": null,
            "alicloud_assume_role_session_expiration": null,
            "alicloud_assume_role_session_name": null,
            "alicloud_region": "xxxxxx",
            "alicloud_secret_key": "VALUE_SPECIFIED_IN_NO_LOG_PARAMETER",
            "alicloud_security_token": null,
            "allocate_public_ip": false,
            "auto_renew": false,
            "auto_renew_period": null,
            "availability_zone": null,
            "count": 1,
            "count_tag": null,
            "description": null,
            "dry_run": false,
            "ecs_role_name": null,
            "force": false,
            "host_name": "vm-test",
            "image": "debian_10_10_uefi_x64_20G_alibase_20210611.vhd",
            "image_id": "debian_10_10_uefi_x64_20G_alibase_20210611.vhd",
            "include_data_disks": true,
            "instance_charge_type": "PostPaid",
            "instance_ids": null,
            "instance_name": "vm-test",
            "instance_type": "ecs.t5-lc1m1.small",
            "internet_charge_type": "PayByBandwidth",
            "key_name": null,
            "max_bandwidth_in": 200,
            "max_bandwidth_out": 0,
            "password": null,
            "period": 1,
            "period_unit": "Month",
            "profile": null,
            "purge_tags": false,
            "ram_role_name": null,
            "security_groups": [
                "sg-xxxxxx"
            ],
            "shared_credentials_file": null,
            "spot_price_limit": null,
            "spot_strategy": "NoSpot",
            "state": "stopped",
            "system_disk_category": "cloud_efficiency",
            "system_disk_description": null,
            "system_disk_name": null,
            "system_disk_size": 40,
            "tags": null,
            "unique_suffix": false,
            "user_data": null,
            "vswitch_id": "vsw-xxxxxx"
        }
    },
    "msg": "Stop instances got an error: 'NoneType' object has no attribute 'encode'"
}

[tolikkk]

Have the same behavior. Fix with setting user_data variable in ali_instance module. Use just the stub:
user_data: 'stub'

Looks like a bug.