After updating to 1.559 one of my Maven jobs doesn't show up in the job listing.

SEVERE: Failed Loading job <xxxx>
java.lang.NullPointerException
at hudson.maven.MavenModuleSet$3.call(MavenModuleSet.java:784)
at hudson.maven.MavenModuleSet$3.call(MavenModuleSet.java:782)
at hudson.model.ItemGroupMixIn.loadChildren(ItemGroupMixIn.java:115)
at hudson.maven.MavenModuleSet.onLoad(MavenModuleSet.java:782)
at hudson.model.Items.load(Items.java:278)
at jenkins.model.Jenkins$18.run(Jenkins.java:2592)
at org.jvnet.hudson.reactor.TaskGraphBuilder$TaskImpl.run(TaskGraphBuilder.java:169)
at org.jvnet.hudson.reactor.Reactor.runTask(Reactor.java:282)
at jenkins.model.Jenkins$7.runTask(Jenkins.java:903)
at org.jvnet.hudson.reactor.Reactor$2.run(Reactor.java:210)
at org.jvnet.hudson.reactor.Reactor$Node.run(Reactor.java:117)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:744)