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java.lang.NullPointerException at hudson.plugins.im.IMPublisher.notifyChats(IMPublisher.java:530) at hudson.plugins.im.IMPublisher.notifyOnBuildEnd(IMPublisher.java:303) at hudson.plugins.im.IMPublisher.perform(IMPublisher.java:290) at hudson.tasks.BuildStepMonitor$3.perform(BuildStepMonitor.java:36) at hudson.model.AbstractBuild$AbstractBuildExecution.perform(AbstractBuild.java:717) at hudson.model.AbstractBuild$AbstractBuildExecution.performAllBuildSteps(AbstractBuild.java:692) at hudson.model.Build$BuildExecution.post2(Build.java:183) at hudson.model.AbstractBuild$AbstractBuildExecution.post(AbstractBuild.java:639) at hudson.model.Run.execute(Run.java:1509) at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:46) at hudson.model.ResourceController.execute(ResourceController.java:88) at hudson.model.Executor.run(Executor.java:236)