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java.lang.NullPointerException: 	at hudson.maven.MavenModuleSetBuild.getEnvironment(MavenModuleSetBuild.java:172)	at hudson.scm.SubversionSCM.compareRemoteRevisionWith(SubversionSCM.java:1095)	at hudson.scm.SCM._compareRemoteRevisionWith(SCM.java:355)	at hudson.scm.SCM.poll(SCM.java:372)	at hudson.model.AbstractProject.poll(AbstractProject.java:1324)	at hudson.triggers.SCMTrigger$Runner.runPolling(SCMTrigger.java:420)	at hudson.triggers.SCMTrigger$Runner.run(SCMTrigger.java:449)	at hudson.util.SequentialExecutionQueue$QueueEntry.run(SequentialExecutionQueue.java:118)	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)	at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)	at java.util.concurrent.FutureTask.run(FutureTask.java:138)	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)	at java.lang.Thread.run(Thread.java:662)