SEVERE: Failed to record SCM polling for hudson.maven.MavenModuleSet@1118b490[testing-parent-trunk]
java.lang.IllegalArgumentException: Null value not allowed as an environment variable: POM_PACKAGING
        at hudson.EnvVars.put(EnvVars.java:356)
        at hudson.maven.MavenModuleSetBuild.getEnvironment(MavenModuleSetBuild.java:194)
        at hudson.scm.SubversionSCM.compareRemoteRevisionWith(SubversionSCM.java:1235)
        at hudson.scm.SCM._compareRemoteRevisionWith(SCM.java:356)
        at hudson.scm.SCM.poll(SCM.java:373)
        at hudson.model.AbstractProject._poll(AbstractProject.java:1584)
        at hudson.model.AbstractProject.poll(AbstractProject.java:1493)
        at hudson.triggers.SCMTrigger$Runner.runPolling(SCMTrigger.java:456)
        at hudson.triggers.SCMTrigger$Runner.run(SCMTrigger.java:485)
        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:619)