NullPointerException in Declarative Jenkinsfile Pipeline Syntax Validator (when clause)

pipeline {
  agent { label 'Some Machine' }
  
  parameters {
    string(name: 'Type', defaultValue: 'Nightly', description: 'Type of build to perform -- can be "Nightly," "CI," or "PR"')
  }

  stages {

    stage('Fix Me') {
      when {
        params.Type == 'CI'
      }

      steps {
        echo "Hello World"
      }
    }
  }
}