01:42:30 [SEVERE] null
org.bukkit.command.CommandException: Unhandled exception executing command 'ma' in plugin MobArena v0.94.4.13
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:42)
        at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:168)
        at org.bukkit.craftbukkit.CraftServer.dispatchCommand(CraftServer.java:382)
        at net.minecraft.server.NetServerHandler.handleCommand(NetServerHandler.java:768)
        at net.minecraft.server.NetServerHandler.chat(NetServerHandler.java:728)
        at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:721)
        at lishid.orebfuscator.utils.NetServerHandlerProxy.a(NetServerHandlerProxy.java:101)
        at net.minecraft.server.Packet3Chat.a(Packet3Chat.java:33)
        at net.minecraft.server.NetworkManager.b(NetworkManager.java:226)
        at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:96)
        at lishid.orebfuscator.utils.NetServerHandlerProxy.a(NetServerHandlerProxy.java:44)
        at net.minecraft.server.NetworkListenThread.a(SourceFile:108)
        at net.minecraft.server.MinecraftServer.w(MinecraftServer.java:534)
        at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:432)
        at net.minecraft.server.ThreadServerApplication.run(SourceFile:465)
Caused by: java.lang.NullPointerException
        at com.garbagemule.MobArena.RewardManager.grantRewards(RewardManager.java:47)
        at com.garbagemule.MobArena.ArenaStandard.playerLeave(ArenaStandard.java:669)
        at com.garbagemule.MobArena.MACommands.onCommand(MACommands.java:221)
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:40)
        ... 14 more