Error in console gameserver

This
Exception in thread "GeneralSTPool-13" java.lang.NullPointerException
        at com.l2jfrozen.gameserver.vote.handler.VoteHandler.tryGetIp(VoteHandler.java:153)
        at com.l2jfrozen.gameserver.vote.handler.VoteHandler.access$400(VoteHandler.java:29)
        at com.l2jfrozen.gameserver.vote.handler.VoteHandler$AutoVoteEncourageTask.run(VoteHandler.java:319)
        at com.l2jfrozen.gameserver.thread.ThreadPoolManager$RunnableWrapper.run(ThreadPoolManager.java:95)
        at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
        at java.util.concurrent.FutureTask.runAndReset(Unknown Source)
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(Unknown Source)
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.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)
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