NPE in 2.18 (Jenkins ver. 2.161)

[vikulin]

java.lang.NullPointerException
at jenkins.plugins.slack.StandardSlackService.(StandardSlackService.java:72)
at jenkins.plugins.slack.StandardSlackService.(StandardSlackService.java:59)
at jenkins.plugins.slack.SlackNotifier.newSlackService(SlackNotifier.java:431)
at jenkins.plugins.slack.SlackNotifier.lambda$slackFactory$0(SlackNotifier.java:464)
at jenkins.plugins.slack.ActiveNotifier.completed(ActiveNotifier.java:142)
at jenkins.plugins.slack.SlackNotifier.perform(SlackNotifier.java:445)
at hudson.tasks.BuildStepMonitor$1.perform(BuildStepMonitor.java:20)
at hudson.model.AbstractBuild$AbstractBuildExecution.perform(AbstractBuild.java:744)
at hudson.model.AbstractBuild$AbstractBuildExecution.performAllBuildSteps(AbstractBuild.java:690)
at hudson.model.Build$BuildExecution.cleanUp(Build.java:196)
at hudson.model.Run.execute(Run.java:1857)
at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:43)
at hudson.model.ResourceController.execute(ResourceController.java:97)
at hudson.model.Executor.run(Executor.java:429)
Build step 'Slack Notifications' marked build as failure

This exception maps to:
@OverRide
public boolean perform(AbstractBuild build, Launcher launcher, BuildListener listener) {
String buildKey = BuildKey.format(build);
BuildAwareLogger log = createLogger(listener);
log.debug(buildKey, "Performing complete notifications");
JenkinsTokenExpander tokenExpander = new JenkinsTokenExpander(listener);
-->>new ActiveNotifier(this, slackFactory(listener), log, tokenExpander).completed(build);
if (notifyRegression) {
log.debug(buildKey, "Performing finalize notifications");
new ActiveNotifier(this, slackFactory(listener), log, tokenExpander).finalized(build);
}
return true;
}

[timja]

Should be fixed in #541