When executing a simple build with build flow, i.e.:
"
build("[jobName]")
"

All my executers die with:
java.lang.NullPointerException
at hudson.model.ParametersAction.getAssignedLabel(ParametersAction.java:128)
at hudson.model.Queue$Item.getAssignedLabel(Queue.java:1457)
at hudson.model.Node.canTake(Node.java:330)
at hudson.model.Queue$JobOffer.canTake(Queue.java:272)
at hudson.model.Queue.maintain(Queue.java:1106)
at hudson.model.Queue.pop(Queue.java:935)
at hudson.model.Executor.grabJob(Executor.java:297)
at hudson.model.Executor.run(Executor.java:211)