[SEVERE] null
org.bukkit.command.CommandException: Unhandled exception executing command 'ban' in plugin AdminTools v0.5
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:21)
        at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:77)
        at org.bukkit.craftbukkit.CraftServer.dispatchCommand(CraftServer.java:173)
        at net.minecraft.server.NetServerHandler.c(NetServerHandler.java:633)
        at net.minecraft.server.NetServerHandler.chat(NetServerHandler.java:596)
        at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:590)
        at net.minecraft.server.Packet3Chat.a(SourceFile:24)
        at net.minecraft.server.NetworkManager.a(SourceFile:230)
        at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:70)
        at net.minecraft.server.NetworkListenThread.a(SourceFile:100)
        at net.minecraft.server.MinecraftServer.h(MinecraftServer.java:338)
        at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:253)
        at net.minecraft.server.ThreadServerApplication.run(SourceFile:366)
Caused by: java.lang.NullPointerException
        at com.bukkit.Stefan.AdminTools.AdminTool.handleBanCommand(AdminTool.java:149)
        at com.bukkit.Stefan.AdminTools.AdminTool.onCommand(AdminTool.java:712)
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:19)
        ... 12 more