Minecraft PvP 2.0 Error

[19:39:34] [Server thread/INFO]: giotex15 issued server command: /pvp kit default2
[19:39:34] [Server thread/ERROR]: null
org.bukkit.command.CommandException: Unhandled exception executing command 'pvp' in plugin PvP v1.0-b5
	at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46) ~[spigot.jar:git-Spigot-c55900f-9af379f]
	at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:141) ~[spigot.jar:git-Spigot-c55900f-9af379f]
	at org.bukkit.craftbukkit.v1_10_R1.CraftServer.dispatchCommand(CraftServer.java:646) ~[spigot.jar:git-Spigot-c55900f-9af379f]
	at net.minecraft.server.v1_10_R1.PlayerConnection.handleCommand(PlayerConnection.java:1351) [spigot.jar:git-Spigot-c55900f-9af379f]
	at net.minecraft.server.v1_10_R1.PlayerConnection.a(PlayerConnection.java:1186) [spigot.jar:git-Spigot-c55900f-9af379f]
	at net.minecraft.server.v1_10_R1.PacketPlayInChat.a(PacketPlayInChat.java:45) [spigot.jar:git-Spigot-c55900f-9af379f]
	at net.minecraft.server.v1_10_R1.PacketPlayInChat.a(PacketPlayInChat.java:1) [spigot.jar:git-Spigot-c55900f-9af379f]
	at net.minecraft.server.v1_10_R1.PlayerConnectionUtils$1.run(SourceFile:13) [spigot.jar:git-Spigot-c55900f-9af379f]
	at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) [?:1.8.0_77]
	at java.util.concurrent.FutureTask.run(Unknown Source) [?:1.8.0_77]
	at net.minecraft.server.v1_10_R1.SystemUtils.a(SourceFile:45) [spigot.jar:git-Spigot-c55900f-9af379f]
	at net.minecraft.server.v1_10_R1.MinecraftServer.D(MinecraftServer.java:733) [spigot.jar:git-Spigot-c55900f-9af379f]
	at net.minecraft.server.v1_10_R1.DedicatedServer.D(DedicatedServer.java:399) [spigot.jar:git-Spigot-c55900f-9af379f]
	at net.minecraft.server.v1_10_R1.MinecraftServer.C(MinecraftServer.java:672) [spigot.jar:git-Spigot-c55900f-9af379f]
	at net.minecraft.server.v1_10_R1.MinecraftServer.run(MinecraftServer.java:571) [spigot.jar:git-Spigot-c55900f-9af379f]
	at java.lang.Thread.run(Unknown Source) [?:1.8.0_77]
Caused by: java.lang.NullPointerException
	at at.lukasberger.bukkit.pvp.core.KitUtils.buyKit(KitUtils.java:24) ~[?:?]
	at at.lukasberger.bukkit.pvp.commands.player.PlayerKitCommand.execute(PlayerKitCommand.java:39) ~[?:?]
	at at.lukasberger.bukkit.pvp.commands.SubCommandManager.executeSubCommand(SubCommandManager.java:124) ~[?:?]
	at at.lukasberger.bukkit.pvp.PvP.onCommand(PvP.java:280) ~[?:?]
	at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44) ~[spigot.jar:git-Spigot-c55900f-9af379f]
	... 15 more