terraform-provider-aws: Cognito domain doesn't delete during destroy

Terraform Version

Terraform v0.10.8 AWS provider 1.21.0

Affected Resource(s)

aws_cognito_user_pool_domain

Terraform Configuration Files

Below is an excerpt from terraform file to create aws_cognito_user_pool_domain .

# Pool domain
resource "aws_cognito_user_pool_domain" "domain" {
  domain       = "${var.userpooldomain}"
  user_pool_id = "${aws_cognito_user_pool.pool.id}"
}

Debug Output

Panic Output

Expected Behavior

domain should be deleted by terraform apply, when the resource is marked for destroy.

Actual Behavior

Domain isn’t deleted and throws error message

aws_cognito_user_pool_domain.domain: InvalidParameter: 1 validation error(s) found.

• minimum field size of 1, DeleteUserPoolDomainInput.UserPoolId.

Steps to Reproduce

1. Change the module name
2. Run terraform plan and apply(Module name is changed and existing pool is deleted and a new user pool(with new name) is created.
3. Modify any change for the new user pool
4. terraform plan
5. terraform apply