java.lang.ClassCastException: org.jenkinsci.plugins.workflow.job.WorkflowRun cannot be cast to hudson.model.AbstractBuild
	at org.jenkinsci.plugins.githubissues.GitHubIssueNotifier.perform(GitHubIssueNotifier.java:139)
	at org.jenkinsci.plugins.workflow.steps.CoreStep$Execution.run(CoreStep.java:78)
	at org.jenkinsci.plugins.workflow.steps.CoreStep$Execution.run(CoreStep.java:65)
	at org.jenkinsci.plugins.workflow.steps.SynchronousNonBlockingStepExecution$1$1.call(SynchronousNonBlockingStepExecution.java:49)
	at hudson.security.ACL.impersonate(ACL.java:260)
	at org.jenkinsci.plugins.workflow.steps.SynchronousNonBlockingStepExecution$1.run(SynchronousNonBlockingStepExecution.java:46)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:473)
	at java.util.concurrent.FutureTask.run(FutureTask.java:262)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
	at java.lang.Thread.run(Thread.java:745)

node {
    try {
        sh "ls 1234"
    }
    finally {
        step([$class: 'GitHubIssueNotifier', 
            issueAppend: true, issueBody: '''
            Build \'$JOB_NAME\' has failed!
            
            Last 50 lines of output:
            
            ```
            ${OUTPUT, lines=50}
            ```
            
            [View full output]($BUILD_URL)''', 
            issueLabel: 'Urgency-High', 
            issueRepo: '<a repo>', 
            issueTitle: '$JOB_NAME $BUILD_DISPLAY_NAME failed'])
    }
}