[13:31:55 ERROR]: null
org.bukkit.command.CommandException: Unhandled exception executing command 'countdown' in plugin VBTimer v1.0
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46) ~[Paper-1.12.2-b1616.jar:git-Paper-1616]
        at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:152) ~[Paper-1.12.2-b1616.jar:git-Paper-1616]
        at org.bukkit.craftbukkit.v1_12_R1.CraftServer.dispatchCommand(CraftServer.java:685) ~[Paper-1.12.2-b1616.jar:git-Paper-1616]
        at net.minecraft.server.v1_12_R1.PlayerConnection.handleCommand(PlayerConnection.java:1492) ~[Paper-1.12.2-b1616.jar:git-Paper-1616]
        at net.minecraft.server.v1_12_R1.PlayerConnection.a(PlayerConnection.java:1297) ~[Paper-1.12.2-b1616.jar:git-Paper-1616]
        at net.minecraft.server.v1_12_R1.PacketPlayInChat.a(PacketPlayInChat.java:45) ~[Paper-1.12.2-b1616.jar:git-Paper-1616]
        at net.minecraft.server.v1_12_R1.PacketPlayInChat.a(PacketPlayInChat.java:5) ~[Paper-1.12.2-b1616.jar:git-Paper-1616]
        at net.minecraft.server.v1_12_R1.PlayerConnectionUtils.lambda$ensureMainThread$0(PlayerConnectionUtils.java:14) ~[Paper-1.12.2-b1616.jar:git-Paper-1616]
        at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) ~[?:1.8.0_211]
        at java.util.concurrent.FutureTask.run(Unknown Source) ~[?:1.8.0_211]
        at net.minecraft.server.v1_12_R1.SystemUtils.a(SourceFile:46) ~[Paper-1.12.2-b1616.jar:git-Paper-1616]
        at net.minecraft.server.v1_12_R1.MinecraftServer.D(MinecraftServer.java:850) ~[Paper-1.12.2-b1616.jar:git-Paper-1616]
        at net.minecraft.server.v1_12_R1.DedicatedServer.D(DedicatedServer.java:423) ~[Paper-1.12.2-b1616.jar:git-Paper-1616]
        at net.minecraft.server.v1_12_R1.MinecraftServer.C(MinecraftServer.java:774) ~[Paper-1.12.2-b1616.jar:git-Paper-1616]
        at net.minecraft.server.v1_12_R1.MinecraftServer.run(MinecraftServer.java:666) ~[Paper-1.12.2-b1616.jar:git-Paper-1616]
        at java.lang.Thread.run(Unknown Source) [?:1.8.0_211]
Caused by: java.lang.IndexOutOfBoundsException
        at me.minecraft_server.vbtimer.util.InventoryUtils.split(InventoryUtils.java:48) ~[?:?]
        at me.minecraft_server.vbtimer.util.interfaces.CountdownInterface$CountdownInterfacePlayerData.lambda$4(CountdownInterface.java:83) ~[?:?]
        at me.minecraft_server.vbtimer.util.CacheSystem.get(CacheSystem.java:24) ~[?:?]
        at me.minecraft_server.vbtimer.util.interfaces.CountdownInterface$CountdownInterfacePlayerData.update(CountdownInterface.java:104) ~[?:?]
        at me.minecraft_server.vbtimer.util.interfaces.CountdownInterface.getInventory(CountdownInterface.java:33) ~[?:?]
        at me.minecraft_server.vbtimer.util.interfaces.InterfaceManager.open(InterfaceManager.java:33) ~[?:?]
        at me.minecraft_server.vbtimer.commands.CountdownCommand.onCommand(CountdownCommand.java:43) ~[?:?]
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44) ~[Paper-1.12.2-b1616.jar:git-Paper-1616]
        ... 15 more