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via GitHub by momothereal
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This exception has no message.
java.lang.NullPointerException at net.glowstone.inventory.GlowInventory.tryToFillSlots(GlowInventory.java:200) at net.glowstone.inventory.GlowPlayerInventory.handleShiftClick(GlowPlayerInventory.java:155) at net.glowstone.net.handler.play.inv.WindowClickHandler.process(WindowClickHandler.java:325) at net.glowstone.net.handler.play.inv.WindowClickHandler.handle(WindowClickHandler.java:32) at net.glowstone.net.handler.play.inv.WindowClickHandler.handle(WindowClickHandler.java:27) 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:474) at java.util.concurrent.ConcurrentHashMap$KeySetView.forEach(Unknown Source) at net.glowstone.net.SessionRegistry.pulse(SessionRegistry.java:23) at net.glowstone.scheduler.GlowScheduler.pulse(GlowScheduler.java:144) at net.glowstone.scheduler.GlowScheduler.lambda$start$0(GlowScheduler.java:83) at java.util.concurrent.Executors$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)