java.lang.NullPointerException: This exception has no message.
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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)