20:06:01 [SEVERE] null
org.bukkit.command.CommandException: Unhandled exception executing command 'ban'
 in plugin MCBans v2.7.4
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:37)
        at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:80
)
        at org.bukkit.craftbukkit.CraftServer.dispatchCommand(CraftServer.java:2
29)
        at net.minecraft.server.NetServerHandler.c(NetServerHandler.java:645)
        at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:602)
        at net.minecraft.server.Packet3Chat.a(SourceFile:24)
        at net.minecraft.server.NetworkManager.a(SourceFile:230)
        at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:76)
        at net.minecraft.server.NetworkListenThread.a(SourceFile:100)
        at net.minecraft.server.MinecraftServer.h(MinecraftServer.java:357)
        at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:272)
        at net.minecraft.server.ThreadServerApplication.run(SourceFile:366)
Caused by: java.lang.NullPointerException
        at com.firestar.mcbans.mcbans_handler.ban(mcbans_handler.java:172)
        at com.firestar.mcbans.mcbans.onCommand(mcbans.java:229)
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:35)
        ... 12 more