Gungame Error

[21:15:33 ERROR]: null
org.bukkit.command.CommandException: Unhandled exception executing command 'gungame' in plugin MGGungame v1.6.5
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46) ~[craftbukkit-1.7.9-R0.2.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks]
        at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:180) ~[craftbukkit-1.7.9-R0.2.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b309
2jnks]
        at org.bukkit.craftbukkit.v1_7_R3.CraftServer.dispatchCommand(CraftServer.java:701) ~[craftbukkit-1.7.9-R0.2.jar:git-Bukkit-1.7.9-R0.1-10-g868
8bd4-b3092jnks]
        at net.minecraft.server.v1_7_R3.PlayerConnection.handleCommand(PlayerConnection.java:956) [craftbukkit-1.7.9-R0.2.jar:git-Bukkit-1.7.9-R0.1-10
-g8688bd4-b3092jnks]
        at net.minecraft.server.v1_7_R3.PlayerConnection.a(PlayerConnection.java:817) [craftbukkit-1.7.9-R0.2.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3
092jnks]
        at net.minecraft.server.v1_7_R3.PacketPlayInChat.a(PacketPlayInChat.java:28) [craftbukkit-1.7.9-R0.2.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b30
92jnks]
        at net.minecraft.server.v1_7_R3.PacketPlayInChat.handle(PacketPlayInChat.java:47) [craftbukkit-1.7.9-R0.2.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd
4-b3092jnks]
        at net.minecraft.server.v1_7_R3.NetworkManager.a(NetworkManager.java:157) [craftbukkit-1.7.9-R0.2.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092j
nks]
        at net.minecraft.server.v1_7_R3.ServerConnection.c(SourceFile:134) [craftbukkit-1.7.9-R0.2.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks]
        at net.minecraft.server.v1_7_R3.MinecraftServer.v(MinecraftServer.java:667) [craftbukkit-1.7.9-R0.2.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b309
2jnks]
        at net.minecraft.server.v1_7_R3.DedicatedServer.v(DedicatedServer.java:260) [craftbukkit-1.7.9-R0.2.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b309
2jnks]
        at net.minecraft.server.v1_7_R3.MinecraftServer.u(MinecraftServer.java:558) [craftbukkit-1.7.9-R0.2.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b309
2jnks]
        at net.minecraft.server.v1_7_R3.MinecraftServer.run(MinecraftServer.java:469) [craftbukkit-1.7.9-R0.2.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3
092jnks]
        at net.minecraft.server.v1_7_R3.ThreadServerApplication.run(SourceFile:628) [craftbukkit-1.7.9-R0.2.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b309
2jnks]
Caused by: java.lang.NullPointerException
        at com.comze_instancelabs.gungame.Main.getTop5(Main.java:473) ~[?:?]
        at com.comze_instancelabs.gungame.Main.onCommand(Main.java:164) ~[?:?]
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44) ~[craftbukkit-1.7.9-R0.2.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks]
        ... 13 more
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