FourSepulchersManager - NullPointerException

[Swarlog Ilumy]

Error to start server:

Exception in thread "GeneralSTPool-8" java.lang.NullPointerException
    at com.l2jserver.gameserver.instancemanager.FourSepulchersManager.clean(FourSepulchersManager.java:257)
    at com.l2jserver.gameserver.instancemanager.tasks.FourSepulchersChangeCoolDownTimeTask.run(FourSepulchersChangeCoolDownTimeTask.java:42)
    at com.l2jserver.gameserver.ThreadPoolManager$RunnableWrapper.run(ThreadPoolManager.java:89)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
    at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
    at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at java.lang.Thread.run(Thread.java:748)

[Swarlog Ilumy]

Only in my test server, FAIL!