I want to return an error from my groovy script and used for it System.exit(13).It caused shutdown of jenkins.
The script was startet using jenkins-cli.
...
if(args.length < 2){
System.exit(13)
}
...

Finally I found a workaround and use RuntimeException in my script and the job finished as expected as failed. But jenkins cann still continue his work
...
if(args.length < 2)

{ throw new RuntimeException("Mandatory Parameter BRANCH_NAME is missing! Operation ist aborted!") }

...