[20:27:46 INFO]: Blackmine57: Reload complete.
[20:27:46 INFO]: Blackmine57 issued server command: /hub
[20:27:46 ERROR]: null
org.bukkit.command.CommandException: Unhandled exception executing command 'hub'
 in plugin Hub v1.0
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46) ~[spi
got.jar:git-Spigot-b4417b8-3c48711]
        at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:14
1) ~[spigot.jar:git-Spigot-b4417b8-3c48711]
        at org.bukkit.craftbukkit.v1_11_R1.CraftServer.dispatchCommand(CraftServ
er.java:650) ~[spigot.jar:git-Spigot-b4417b8-3c48711]
        at net.minecraft.server.v1_11_R1.PlayerConnection.handleCommand(PlayerCo
nnection.java:1344) [spigot.jar:git-Spigot-b4417b8-3c48711]
        at net.minecraft.server.v1_11_R1.PlayerConnection.a(PlayerConnection.jav
a:1179) [spigot.jar:git-Spigot-b4417b8-3c48711]
        at net.minecraft.server.v1_11_R1.PacketPlayInChat.a(PacketPlayInChat.jav
a:45) [spigot.jar:git-Spigot-b4417b8-3c48711]
        at net.minecraft.server.v1_11_R1.PacketPlayInChat.a(PacketPlayInChat.jav
a:1) [spigot.jar:git-Spigot-b4417b8-3c48711]
        at net.minecraft.server.v1_11_R1.PlayerConnectionUtils$1.run(SourceFile:
13) [spigot.jar:git-Spigot-b4417b8-3c48711]
        at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) [
?:1.8.0_121]
        at java.util.concurrent.FutureTask.run(Unknown Source) [?:1.8.0_121]
        at net.minecraft.server.v1_11_R1.SystemUtils.a(SourceFile:46) [spigot.ja
r:git-Spigot-b4417b8-3c48711]
        at net.minecraft.server.v1_11_R1.MinecraftServer.D(MinecraftServer.java:
747) [spigot.jar:git-Spigot-b4417b8-3c48711]
        at net.minecraft.server.v1_11_R1.DedicatedServer.D(DedicatedServer.java:
399) [spigot.jar:git-Spigot-b4417b8-3c48711]
        at net.minecraft.server.v1_11_R1.MinecraftServer.C(MinecraftServer.java:
678) [spigot.jar:git-Spigot-b4417b8-3c48711]
        at net.minecraft.server.v1_11_R1.MinecraftServer.run(MinecraftServer.jav
a:576) [spigot.jar:git-Spigot-b4417b8-3c48711]
        at java.lang.Thread.run(Unknown Source) [?:1.8.0_121]
Caused by: java.lang.NullPointerException
        at fr.hub.black.hub.onCommand(hub.java:37) ~[?:?]
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44) ~[spi
got.jar:git-Spigot-b4417b8-3c48711]
        ... 15 more