java.lang.NullPointerException
	at org.jenkinsci.plugins.workflow.cps.persistence.IteratorHack.writeReplace(IteratorHack.java:52)
	at org.jenkinsci.plugins.workflow.cps.ParamsVariable.addValue(ParamsVariable.java:88)
	at org.jenkinsci.plugins.workflow.cps.ParamsVariable.getValue(ParamsVariable.java:66)
	at org.jenkinsci.plugins.workflow.cps.CpsScript.getProperty(CpsScript.java:121)
	at org.codehaus.groovy.runtime.InvokerHelper.getProperty(InvokerHelper.java:172)
	at groovy.lang.Closure.getPropertyTryThese(Closure.java:312)
	at groovy.lang.Closure.getPropertyOwnerFirst(Closure.java:306)
	at groovy.lang.Closure.getProperty(Closure.java:295)
	at org.codehaus.groovy.runtime.InvokerHelper.getProperty(InvokerHelper.java:172)
	at groovy.lang.Closure.getPropertyTryThese(Closure.java:312)
	at groovy.lang.Closure.getPropertyOwnerFirst(Closure.java:306)
	at groovy.lang.Closure.getProperty(Closure.java:295)
	at org.codehaus.groovy.runtime.InvokerHelper.getProperty(InvokerHelper.java:172)
	at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.getProperty(ScriptBytecodeAdapter.java:456)
	at com.cloudbees.groovy.cps.sandbox.DefaultInvoker.getProperty(DefaultInvoker.java:33)
	at com.cloudbees.groovy.cps.impl.PropertyAccessBlock.rawGet(PropertyAccessBlock.java:20)
	at Script2.run(Script2.groovy:178)
	at ___cps.transform___(Native Method)
	at com.cloudbees.groovy.cps.impl.PropertyishBlock$ContinuationImpl.get(PropertyishBlock.java:74)
	at com.cloudbees.groovy.cps.LValueBlock$GetAdapter.receive(LValueBlock.java:30)
	at com.cloudbees.groovy.cps.impl.PropertyishBlock$ContinuationImpl.fixName(PropertyishBlock.java:66)
	at sun.reflect.GeneratedMethodAccessor463.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
	at java.lang.reflect.Method.invoke(Unknown Source)
	at com.cloudbees.groovy.cps.impl.ContinuationPtr$ContinuationImpl.receive(ContinuationPtr.java:72)
	at com.cloudbees.groovy.cps.impl.ConstantBlock.eval(ConstantBlock.java:21)
	at com.cloudbees.groovy.cps.Next.step(Next.java:74)
	at com.cloudbees.groovy.cps.Continuable.run0(Continuable.java:154)
	at org.jenkinsci.plugins.workflow.cps.CpsThread.runNextChunk(CpsThread.java:163)
	at org.jenkinsci.plugins.workflow.cps.CpsThreadGroup.run(CpsThreadGroup.java:328)
	at org.jenkinsci.plugins.workflow.cps.CpsThreadGroup.access$100(CpsThreadGroup.java:80)
	at org.jenkinsci.plugins.workflow.cps.CpsThreadGroup$2.call(CpsThreadGroup.java:240)
	at org.jenkinsci.plugins.workflow.cps.CpsThreadGroup$2.call(CpsThreadGroup.java:228)
	at org.jenkinsci.plugins.workflow.cps.CpsVmExecutorService$2.call(CpsVmExecutorService.java:63)
	at java.util.concurrent.FutureTask$Sync.innerRun(Unknown Source)
	at java.util.concurrent.FutureTask.run(Unknown Source)
	at hudson.remoting.SingleLaneExecutorService$1.run(SingleLaneExecutorService.java:112)
	at jenkins.util.ContextResettingExecutorService$1.run(ContextResettingExecutorService.java:28)
	at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
	at java.util.concurrent.FutureTask$Sync.innerRun(Unknown Source)
	at java.util.concurrent.FutureTask.run(Unknown Source)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
	at java.lang.Thread.run(Unknown Source)