[00:26:47] [Server thread/ERROR]: Could not pass event InventoryClickEvent to MysteryBoxes v4.0.18
org.bukkit.event.EventException: null
	at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:309) ~[spigot.jar:git-Spigot-f56e2e7-07e504c]
	at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[spigot.jar:git-Spigot-f56e2e7-07e504c]
	at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:500) ~[spigot.jar:git-Spigot-f56e2e7-07e504c]
	at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:485) ~[spigot.jar:git-Spigot-f56e2e7-07e504c]
	at net.minecraft.server.v1_13_R2.PlayerConnection.a(PlayerConnection.java:2122) ~[spigot.jar:git-Spigot-f56e2e7-07e504c]
	at net.minecraft.server.v1_13_R2.PacketPlayInWindowClick.a(SourceFile:33) ~[spigot.jar:git-Spigot-f56e2e7-07e504c]
	at net.minecraft.server.v1_13_R2.PacketPlayInWindowClick.a(SourceFile:10) ~[spigot.jar:git-Spigot-f56e2e7-07e504c]
	at net.minecraft.server.v1_13_R2.PlayerConnectionUtils.a(SourceFile:10) ~[spigot.jar:git-Spigot-f56e2e7-07e504c]
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [?:1.8.0_121]
	at java.util.concurrent.FutureTask.run(FutureTask.java:266) [?:1.8.0_121]
	at net.minecraft.server.v1_13_R2.SystemUtils.a(SourceFile:199) [spigot.jar:git-Spigot-f56e2e7-07e504c]
	at net.minecraft.server.v1_13_R2.MinecraftServer.b(MinecraftServer.java:896) [spigot.jar:git-Spigot-f56e2e7-07e504c]
	at net.minecraft.server.v1_13_R2.DedicatedServer.b(DedicatedServer.java:417) [spigot.jar:git-Spigot-f56e2e7-07e504c]
	at net.minecraft.server.v1_13_R2.MinecraftServer.a(MinecraftServer.java:831) [spigot.jar:git-Spigot-f56e2e7-07e504c]
	at net.minecraft.server.v1_13_R2.MinecraftServer.run(MinecraftServer.java:729) [spigot.jar:git-Spigot-f56e2e7-07e504c]
	at java.lang.Thread.run(Thread.java:745) [?:1.8.0_121]
Caused by: java.lang.NullPointerException
	at me.xericker.mysteryboxes.menus.menus.craftboxes.CraftBoxesMenu.onInventoryClick(CraftBoxesMenu.java:135) ~[MysteryBoxes.jar:?]
	at sun.reflect.GeneratedMethodAccessor141.invoke(Unknown Source) ~[?:?]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_121]
	at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_121]
	at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:305) ~[spigot.jar:git-Spigot-f56e2e7-07e504c]
	... 15 more