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+[17:01:58 INFO]: DarkMbs issued server command: /slayer level
+[17:01:58 ERROR]: null
+org.bukkit.command.CommandException: Unhandled exception executing command 'slayer' in plugin AdderSlayer v1.0
+ at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46) ~[server.jar:git-Spigot-dcd1643-e60fc34]
+ at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:141) ~[server.jar:git-Spigot-dcd1643-e60fc34]
+ at org.bukkit.craftbukkit.v1_12_R1.CraftServer.dispatchCommand(CraftServer.java:648) ~[server.jar:git-Spigot-dcd1643-e60fc34]
+ at net.minecraft.server.v1_12_R1.PlayerConnection.handleCommand(PlayerConnection.java:1399) [server.jar:git-Spigot-dcd1643-e60fc34]
+ at net.minecraft.server.v1_12_R1.PlayerConnection.a(PlayerConnection.java:1234) [server.jar:git-Spigot-dcd1643-e60fc34]
+ at net.minecraft.server.v1_12_R1.PacketPlayInChat.a(PacketPlayInChat.java:45) [server.jar:git-Spigot-dcd1643-e60fc34]
+ at net.minecraft.server.v1_12_R1.PacketPlayInChat.a(PacketPlayInChat.java:1) [server.jar:git-Spigot-dcd1643-e60fc34]
+ at net.minecraft.server.v1_12_R1.PlayerConnectionUtils$1.run(SourceFile:13) [server.jar:git-Spigot-dcd1643-e60fc34]
+ at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [?:1.8.0_212]
+ at java.util.concurrent.FutureTask.run(FutureTask.java:266) [?:1.8.0_212]
+ at net.minecraft.server.v1_12_R1.SystemUtils.a(SourceFile:46) [server.jar:git-Spigot-dcd1643-e60fc34]
+ at net.minecraft.server.v1_12_R1.MinecraftServer.D(MinecraftServer.java:748) [server.jar:git-Spigot-dcd1643-e60fc34]
+ at net.minecraft.server.v1_12_R1.DedicatedServer.D(DedicatedServer.java:406) [server.jar:git-Spigot-dcd1643-e60fc34]
+ at net.minecraft.server.v1_12_R1.MinecraftServer.C(MinecraftServer.java:679) [server.jar:git-Spigot-dcd1643-e60fc34]
+ at net.minecraft.server.v1_12_R1.MinecraftServer.run(MinecraftServer.java:577) [server.jar:git-Spigot-dcd1643-e60fc34]
+ at java.lang.Thread.run(Thread.java:748) [?:1.8.0_212]
+Caused by: java.lang.NullPointerException
+ at me.darkmbs.adderslayer.Commands.subcommand.LevelCommand.perform(LevelCommand.java:38) ~[?:?]
+ at me.darkmbs.adderslayer.Commands.CommandManager.onCommand(CommandManager.java:31) ~[?:?]
+ at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44) ~[server.jar:git-Spigot-dcd1643-e60fc34]
+ ... 15 more
+>