Build failed in Jenkins: ActiveMQ-SysTest-Trunk #8

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See <https://builds.apache.org/job/ActiveMQ-SysTest-Trunk/8/>

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Started by an SCM change
Building remotely on ubuntu3 in workspace 
<https://builds.apache.org/job/ActiveMQ-SysTest-Trunk/ws/>
FATAL: Null value not allowed as an environment variable: POM_PACKAGING
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.checkout(SubversionSCM.java:781)
        at hudson.model.AbstractProject.checkout(AbstractProject.java:1414)
        at 
hudson.model.AbstractBuild$AbstractBuildExecution.defaultCheckout(AbstractBuild.java:652)
        at jenkins.scm.SCMCheckoutStrategy.checkout(SCMCheckoutStrategy.java:88)
        at 
hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:561)
        at hudson.model.Run.execute(Run.java:1678)
        at hudson.maven.MavenModuleSetBuild.run(MavenModuleSetBuild.java:519)
        at hudson.model.ResourceController.execute(ResourceController.java:88)
        at hudson.model.Executor.run(Executor.java:231)