java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at net.glowstone.net.handler.play.player.BlockPlacementHandler.handle(BlockPlacementHandler.java:129)
at net.glowstone.net.handler.play.player.BlockPlacementHandler.handle(BlockPlacementHandler.java:22)
at net.glowstone.libs.com.flowpowered.network.session.BasicSession.handleMessage(BasicSession.java:80)
at net.glowstone.libs.com.flowpowered.network.session.BasicSession.messageReceived(BasicSession.java:139)
at net.glowstone.net.GlowSession.pulse(GlowSession.java:462)
at net.glowstone.net.SessionRegistry.pulse(SessionRegistry.java:23)
at net.glowstone.scheduler.GlowScheduler.pulse(GlowScheduler.java:144)
at net.glowstone.scheduler.GlowScheduler.lambda$start$39(GlowScheduler.java:83)
at java.util.concurrent.Executors$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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