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

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java.lang.NullPointerException:
at net.glowstone.inventory.GlowMetaPotion.dataToString(GlowMetaPotion.java:191)
at net.glowstone.inventory.GlowMetaPotion.writeNbt(GlowMetaPotion.java:87)
at net.glowstone.inventory.GlowItemFactory.writeNbt(GlowItemFactory.java:80)
at net.glowstone.io.nbt.NbtSerialization.writeItem(NbtSerialization.java:74)
at net.glowstone.io.nbt.NbtSerialization.writeInventory(NbtSerialization.java:112)
at net.glowstone.block.entity.TEContainer.saveNbt(TEContainer.java:45)
at net.glowstone.GlowChunk.toMessage(GlowChunk.java:697)
at net.glowstone.GlowChunk.toMessage(GlowChunk.java:616)
at net.glowstone.entity.GlowPlayer.streamBlocks(GlowPlayer.java:714)
at net.glowstone.entity.GlowPlayer.spawnAt(GlowPlayer.java:761)
at net.glowstone.entity.GlowPlayer.teleport(GlowPlayer.java:1524)
at net.glowstone.entity.GlowPlayer.teleport(GlowPlayer.java:1506)
at net.daboross.bukkitdev.skywars.world.SkyWorldHandler.onGameStart1(SkyWorldHandler.java:173)
at net.daboross.bukkitdev.skywars.events.GameEventDistributor.distribute(GameEventDistributor.java:72)
at net.daboross.bukkitdev.skywars.game.GameHandler.startNewGame(GameHandler.java:51)
at net.daboross.bukkitdev.skywars.commands.mainsubcommands.ForceStartCommand.runCommand$7bc4b72f(ForceStartCommand.java:42)
at net.daboross.bukkitdev.skywars.libraries.commands.CommandExecutorBase.onCommand(CommandExecutorBase.java:54)
at org.bukkit.command.PluginCommand.execute(PluginCommand.java:45)
at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:194)
at net.glowstone.GlowServer.dispatchCommand(GlowServer.java:1244)
at net.glowstone.ConsoleManager$CommandTask.run(ConsoleManager.java:284)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at net.glowstone.scheduler.GlowTask.run(GlowTask.java:167)
at net.glowstone.scheduler.GlowScheduler.pulse(GlowScheduler.java:152)
at net.glowstone.scheduler.GlowScheduler.lambda$start$0(GlowScheduler.java:83)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)
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:745)

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