[04:15:56 INFO]: KrusteF issued server command: /rewards
[04:15:56 ERROR]: null
org.bukkit.command.CommandException: Unhandled exception executing command 'rewards' in plugin XLRewards v2.2.8
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:47) ~[wickedprison.jar:git-PaperSpigot-"4c7641d"]
        at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:146) ~[wickedprison.jar:git-PaperSpigot-"4c7641d"]
        at org.bukkit.craftbukkit.v1_8_R3.CraftServer.dispatchCommand(CraftServer.java:666) ~[wickedprison.jar:git-PaperSpigot-"4c7641d"]
        at net.minecraft.server.v1_8_R3.PlayerConnection.handleCommand(PlayerConnection.java:1189) [wickedprison.jar:git-PaperSpigot-"4c7641d"]
        at net.minecraft.server.v1_8_R3.PlayerConnection.a(PlayerConnection.java:1001) [wickedprison.jar:git-PaperSpigot-"4c7641d"]
        at net.minecraft.server.v1_8_R3.PacketPlayInChat.a(PacketPlayInChat.java:45) [wickedprison.jar:git-PaperSpigot-"4c7641d"]
        at net.minecraft.server.v1_8_R3.PacketPlayInChat.a(PacketPlayInChat.java:1) [wickedprison.jar:git-PaperSpigot-"4c7641d"]
        at net.minecraft.server.v1_8_R3.PlayerConnectionUtils$1.run(SourceFile:13) [wickedprison.jar:git-PaperSpigot-"4c7641d"]
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [?:1.8.0_222]
        at java.util.concurrent.FutureTask.run(FutureTask.java:266) [?:1.8.0_222]
        at net.minecraft.server.v1_8_R3.SystemUtils.a(SourceFile:44) [wickedprison.jar:git-PaperSpigot-"4c7641d"]
        at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:774) [wickedprison.jar:git-PaperSpigot-"4c7641d"]
        at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:378) [wickedprison.jar:git-PaperSpigot-"4c7641d"]
        at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:713) [wickedprison.jar:git-PaperSpigot-"4c7641d"]
        at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:616) [wickedprison.jar:git-PaperSpigot-"4c7641d"]
        at java.lang.Thread.run(Thread.java:748) [?:1.8.0_222]
Caused by: java.lang.NullPointerException
        at me.mathiaseklund.xlrewards.items.CustomItem.getItemStack(CustomItem.java:134) ~[?:?]
        at me.mathiaseklund.xlrewards.rewards.RewardsManager.addRewardItems(RewardsManager.java:140) ~[?:?]
        at me.mathiaseklund.xlrewards.rewards.RewardsManager.createRewardsMenu(RewardsManager.java:97) ~[?:?]
        at me.mathiaseklund.xlrewards.rewards.RewardsManager.openRewardsMenu(RewardsManager.java:86) ~[?:?]
        at me.mathiaseklund.xlrewards.rewards.RewardsCommand.onCommand(RewardsCommand.java:29) ~[?:?]
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:45) ~[wickedprison.jar:git-PaperSpigot-"4c7641d"]
        ... 15 more