DChest error

[10:36:32] [Server thread/ERROR]: Could not pass event InventoryCloseEvent to DChest v0.1
org.bukkit.event.EventException
	at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:305) ~[PaperSpigot.jar:git-PaperSpigot-6c710c1-ba32592]
	at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[PaperSpigot.jar:git-PaperSpigot-6c710c1-ba32592]
	at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:502) [PaperSpigot.jar:git-PaperSpigot-6c710c1-ba32592]
	at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:487) [PaperSpigot.jar:git-PaperSpigot-6c710c1-ba32592]
	at org.bukkit.craftbukkit.v1_8_R2.event.CraftEventFactory.handleInventoryCloseEvent(CraftEventFactory.java:838) [PaperSpigot.jar:git-PaperSpigot-6c710c1-ba32592]
	at net.minecraft.server.v1_8_R2.PlayerList.disconnect(PlayerList.java:369) [PaperSpigot.jar:git-PaperSpigot-6c710c1-ba32592]
	at net.minecraft.server.v1_8_R2.PlayerConnection.a(PlayerConnection.java:849) [PaperSpigot.jar:git-PaperSpigot-6c710c1-ba32592]
	at net.minecraft.server.v1_8_R2.NetworkManager.l(NetworkManager.java:315) [PaperSpigot.jar:git-PaperSpigot-6c710c1-ba32592]
	at net.minecraft.server.v1_8_R2.ServerConnection.c(ServerConnection.java:145) [PaperSpigot.jar:git-PaperSpigot-6c710c1-ba32592]
	at net.minecraft.server.v1_8_R2.MinecraftServer.A(MinecraftServer.java:861) [PaperSpigot.jar:git-PaperSpigot-6c710c1-ba32592]
	at net.minecraft.server.v1_8_R2.DedicatedServer.A(DedicatedServer.java:372) [PaperSpigot.jar:git-PaperSpigot-6c710c1-ba32592]
	at net.minecraft.server.v1_8_R2.MinecraftServer.z(MinecraftServer.java:703) [PaperSpigot.jar:git-PaperSpigot-6c710c1-ba32592]
	at net.minecraft.server.v1_8_R2.MinecraftServer.run(MinecraftServer.java:606) [PaperSpigot.jar:git-PaperSpigot-6c710c1-ba32592]
	at java.lang.Thread.run(Unknown Source) [?:1.8.0_05]
Caused by: java.lang.NullPointerException
	at me.gideon.dchest.Main.onClose(Main.java:76) ~[?:?]
	at sun.reflect.GeneratedMethodAccessor1160.invoke(Unknown Source) ~[?:?]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_05]
	at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_05]
	at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:301) ~[PaperSpigot.jar:git-PaperSpigot-6c710c1-ba32592]
	... 13 more