Stop previously running Jenkins pipeline jobs

Jenkinsfile

@NonCPS
def cancelPreviousBuilds() {
    def jobName = env.JOB_NAME
    def buildNumber = env.BUILD_NUMBER.toInteger()
    /* Get job name */
    def currentJob = Jenkins.instance.getItemByFullName(jobName)

    /* Iterating over the builds for specific job */
    for (def build : currentJob.builds) {
        def exec = build.getExecutor()
        /* If there is a build that is currently running and it's not current build */
        if (build.isBuilding() && build.number.toInteger() != buildNumber && exec != null) {
            /* Then stop it */
            exec.interrupt(
                    Result.ABORTED,
                    new CauseOfInterruption.UserInterruption("Aborted by #${currentBuild.number}")
                )
            println("Aborted previously running build #${build.number}")            
        }
    }
}
pipeline {
    agent any
    stages {
        stage('Init') {
            agent { label 'master' }
            steps {
                script {
                    cancelPreviousBuilds()
                }
            }  
        }
        stage('Test') {
            agent { label 'agent' }
            steps {
              //...
            }
        }
    }
}