> [12:18:11 INFO]: Thuzio issued server command: /bossy
> [12:18:11 ERROR]: null
org.bukkit.command.CommandException: Unhandled exception executing command 'bossy' in plugin VexiusBosses v1.7.1
at org.bukkit.command.PluginCommand.execute(PluginCommand.java:47) ~[patched_1.14.2.jar:git-Paper-90]
at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:159) ~[patched_1.14.2.jar:git-Paper-90]
at org.bukkit.craftbukkit.v1_14_R1.CraftServer.dispatchCommand(CraftServer.java:736) ~[patched_1.14.2.jar:git-Paper-90]
at net.minecraft.server.v1_14_R1.PlayerConnection.handleCommand(PlayerConnection.java:1832) ~[patched_1.14.2.jar:git-Paper-90]
at net.minecraft.server.v1_14_R1.PlayerConnection.a(PlayerConnection.java:1640) ~[patched_1.14.2.jar:git-Paper-90]
at net.minecraft.server.v1_14_R1.PacketPlayInChat.a(PacketPlayInChat.java:47) ~[patched_1.14.2.jar:git-Paper-90]
at net.minecraft.server.v1_14_R1.PacketPlayInChat.a(PacketPlayInChat.java:5) ~[patched_1.14.2.jar:git-Paper-90]
at net.minecraft.server.v1_14_R1.PlayerConnectionUtils.lambda$ensureMainThread$0(PlayerConnectionUtils.java:18) ~[patched_1.14.2.jar:git-Paper-90]
at net.minecraft.server.v1_14_R1.TickTask.run(SourceFile:18) ~[patched_1.14.2.jar:git-Paper-90]
at net.minecraft.server.v1_14_R1.IAsyncTaskHandler.executeTask(IAsyncTaskHandler.java:127) ~[patched_1.14.2.jar:git-Paper-90]
at net.minecraft.server.v1_14_R1.IAsyncTaskHandlerReentrant.executeTask(SourceFile:23) ~[patched_1.14.2.jar:git-Paper-90]
at net.minecraft.server.v1_14_R1.IAsyncTaskHandler.executeNext(IAsyncTaskHandler.java:105) ~[patched_1.14.2.jar:git-Paper-90]
at net.minecraft.server.v1_14_R1.MinecraftServer.aW(MinecraftServer.java:999) ~[patched_1.14.2.jar:git-Paper-90]
at net.minecraft.server.v1_14_R1.MinecraftServer.executeNext(MinecraftServer.java:992) ~[patched_1.14.2.jar:git-Paper-90]
at net.minecraft.server.v1_14_R1.IAsyncTaskHandler.awaitTasks(IAsyncTaskHandler.java:115) ~[patched_1.14.2.jar:git-Paper-90]
at net.minecraft.server.v1_14_R1.MinecraftServer.sleepForTick(MinecraftServer.java:976) ~[patched_1.14.2.jar:git-Paper-90]
at net.minecraft.server.v1_14_R1.MinecraftServer.run(MinecraftServer.java:909) ~[patched_1.14.2.jar:git-Paper-90]
at java.lang.Thread.run(Thread.java:748) [?:1.8.0_212]
Caused by: java.lang.IllegalArgumentException: Material cannot be null
at org.apache.commons.lang.Validate.notNull(Validate.java:192) ~[patched_1.14.2.jar:git-Paper-90]
at org.bukkit.inventory.ItemStack.<init>(ItemStack.java:73) ~[patched_1.14.2.jar:git-Paper-90]
at org.bukkit.inventory.ItemStack.<init>(ItemStack.java:61) ~[patched_1.14.2.jar:git-Paper-90]
at com.electro2560.dev.vexiusbosses.utils.Utils.makeItem(Utils.java:56) ~[?:?]
at com.electro2560.dev.vexiusbosses.utils.GUI.updateInv(GUI.java:119) ~[?:?]
at com.electro2560.dev.vexiusbosses.utils.GUI.openGUI(GUI.java:128) ~[?:?]
at com.electro2560.dev.vexiusbosses.commands.BossCommand.onCommand(BossCommand.java:37) ~[?:?]
at org.bukkit.command.PluginCommand.execute(PluginCommand.java:45) ~[patched_1.14.2.jar:git-Paper-90]
... 17 more