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

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java.lang.NullPointerException:
at hudson.plugins.violations.hudson.maven.ViolationsMavenReporter.end(ViolationsMavenReporter.java:96)
at hudson.maven.Maven2Builder.end(Maven2Builder.java:88)
at hudson.maven.MavenModuleSetBuild$RunnerImpl.doRun(MavenModuleSetBuild.java:814)
at hudson.model.AbstractBuild$AbstractRunner.run(AbstractBuild.java:467)
at hudson.model.Run.run(Run.java:1404)
at hudson.maven.MavenModuleSetBuild.run(MavenModuleSetBuild.java:481)
at hudson.model.ResourceController.execute(ResourceController.java:88)
at hudson.model.Executor.run(Executor.java:238)

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