When upgrading to kubernetes 1.5.1 the plugin is not able to find slaves and exits with a nullpointer. Downgrading to 1.4.6 ensures a working system again.

2016-12-14T16:40:45.363065003Z Dec 14, 2016 5:40:45 PM org.csanchez.jenkins.plugins.kubernetes.KubernetesCloud provision
2016-12-14T16:40:45.363120754Z INFO: Excess workload after pending Spot instances: 1
2016-12-14T16:40:45.416494361Z Dec 14, 2016 5:40:45 PM org.csanchez.jenkins.plugins.kubernetes.KubernetesCloud provision
2016-12-14T16:40:45.416535446Z WARNING: Failed to count the # of live instances on Kubernetes
2016-12-14T16:40:45.416546678Z java.lang.NullPointerException
2016-12-14T16:40:45.416555713Z at org.csanchez.jenkins.plugins.kubernetes.KubernetesCloud.addProvisionedSlave(KubernetesCloud.java:592)
2016-12-14T16:40:45.416564822Z at org.csanchez.jenkins.plugins.kubernetes.KubernetesCloud.provision(KubernetesCloud.java:463)
2016-12-14T16:40:45.416573053Z at hudson.slaves.NodeProvisioner$StandardStrategyImpl.apply(NodeProvisioner.java:701)
2016-12-14T16:40:45.416581034Z at hudson.slaves.NodeProvisioner.update(NodeProvisioner.java:307)
2016-12-14T16:40:45.416605118Z at hudson.slaves.NodeProvisioner.access$000(NodeProvisioner.java:60)
2016-12-14T16:40:45.416611833Z at hudson.slaves.NodeProvisioner$NodeProvisionerInvoker.doRun(NodeProvisioner.java:796)
2016-12-14T16:40:45.416616622Z at hudson.triggers.SafeTimerTask.run(SafeTimerTask.java:50)
2016-12-14T16:40:45.416621229Z at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
2016-12-14T16:40:45.416628635Z at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308)
2016-12-14T16:40:45.416667702Z at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180)
2016-12-14T16:40:45.416677958Z at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)
2016-12-14T16:40:45.416684881Z at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
2016-12-14T16:40:45.416689673Z at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
2016-12-14T16:40:45.416695157Z at java.lang.Thread.run(Thread.java:745)
2016-12-14T16:40:45.416699807Z