org.jenkinsci.plugins.ghprb.GhprbTrigger.run() failed for hudson.model.FreeStyleProject@38edc215[Job]
java.lang.NullPointerException
	at org.jenkinsci.plugins.ghprb.GhprbTrigger.run(GhprbTrigger.java:149)
	at hudson.triggers.Trigger.checkTriggers(Trigger.java:266)
	at hudson.triggers.Trigger$Cron.doRun(Trigger.java:214)
	at hudson.triggers.SafeTimerTask.run(SafeTimerTask.java:54)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
	at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:304)
	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:178)
	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
	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:745)