AutoRank Error

[16:13:44 INFO]: linderson9 issued server command: /ar check
[16:13:44 ERROR]: null
org.bukkit.command.CommandException: Unhandled exception executing command 'ar' in plugin AutoRank v1.7
	at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46) ~[spigot.jar:git-Spigot-1193]
	at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:192) ~[spigot.jar:git-Spigot-1193]
	at org.bukkit.craftbukkit.v1_7_R1.CraftServer.dispatchCommand(CraftServer.java:546) ~[spigot.jar:git-Spigot-1193]
	at net.minecraft.server.v1_7_R1.PlayerConnection.handleCommand(PlayerConnection.java:937) [spigot.jar:git-Spigot-1193]
	at net.minecraft.server.v1_7_R1.PlayerConnection.a(PlayerConnection.java:812) [spigot.jar:git-Spigot-1193]
	at net.minecraft.server.v1_7_R1.PacketPlayInChat.a(PacketPlayInChat.java:28) [spigot.jar:git-Spigot-1193]
	at net.minecraft.server.v1_7_R1.PacketPlayInChat.handle(PacketPlayInChat.java:65) [spigot.jar:git-Spigot-1193]
	at net.minecraft.server.v1_7_R1.NetworkManager.a(NetworkManager.java:147) [spigot.jar:git-Spigot-1193]
	at net.minecraft.server.v1_7_R1.ServerConnection.c(SourceFile:134) [spigot.jar:git-Spigot-1193]
	at net.minecraft.server.v1_7_R1.MinecraftServer.u(MinecraftServer.java:651) [spigot.jar:git-Spigot-1193]
	at net.minecraft.server.v1_7_R1.DedicatedServer.u(DedicatedServer.java:259) [spigot.jar:git-Spigot-1193]
	at net.minecraft.server.v1_7_R1.MinecraftServer.t(MinecraftServer.java:534) [spigot.jar:git-Spigot-1193]
	at net.minecraft.server.v1_7_R1.MinecraftServer.run(MinecraftServer.java:446) [spigot.jar:git-Spigot-1193]
	at net.minecraft.server.v1_7_R1.ThreadServerApplication.run(SourceFile:617) [spigot.jar:git-Spigot-1193]
Caused by: java.lang.NullPointerException
	at me.armar.plugins.autorank.Autorank.onCommand(Autorank.java:116) ~[?:?]
	at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44) ~[spigot.jar:git-Spigot-1193]
	... 13 more