[12:48:04 INFO]: CookieFartz issued server command: /ac
[12:48:04 ERROR]: null
org.bukkit.command.CommandException: Unhandled exception executing command 'ac'
in plugin GChat v2.4
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46) ~[spi
got-1.8.7.jar:git-Spigot-f928e7a-e91aed8]
        at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:14
1) ~[spigot-1.8.7.jar:git-Spigot-f928e7a-e91aed8]
        at org.bukkit.craftbukkit.v1_8_R3.CraftServer.dispatchCommand(CraftServe
r.java:642) ~[spigot-1.8.7.jar:git-Spigot-f928e7a-e91aed8]
        at net.minecraft.server.v1_8_R3.PlayerConnection.handleCommand(PlayerCon
nection.java:1135) [spigot-1.8.7.jar:git-Spigot-f928e7a-e91aed8]
        at net.minecraft.server.v1_8_R3.PlayerConnection.a(PlayerConnection.java
:970) [spigot-1.8.7.jar:git-Spigot-f928e7a-e91aed8]
        at net.minecraft.server.v1_8_R3.PacketPlayInChat.a(PacketPlayInChat.java
:45) [spigot-1.8.7.jar:git-Spigot-f928e7a-e91aed8]
        at net.minecraft.server.v1_8_R3.PacketPlayInChat.a(PacketPlayInChat.java
:1) [spigot-1.8.7.jar:git-Spigot-f928e7a-e91aed8]
        at net.minecraft.server.v1_8_R3.PlayerConnectionUtils$1.run(SourceFile:1
3) [spigot-1.8.7.jar:git-Spigot-f928e7a-e91aed8]
        at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) [
?:1.8.0_45]
        at java.util.concurrent.FutureTask.run(Unknown Source) [?:1.8.0_45]
        at net.minecraft.server.v1_8_R3.SystemUtils.a(SystemUtils.java:19) [spig
ot-1.8.7.jar:git-Spigot-f928e7a-e91aed8]
        at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:7
18) [spigot-1.8.7.jar:git-Spigot-f928e7a-e91aed8]
        at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:3
67) [spigot-1.8.7.jar:git-Spigot-f928e7a-e91aed8]
        at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:6
57) [spigot-1.8.7.jar:git-Spigot-f928e7a-e91aed8]
        at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java
:560) [spigot-1.8.7.jar:git-Spigot-f928e7a-e91aed8]
        at java.lang.Thread.run(Unknown Source) [?:1.8.0_45]
Caused by: java.lang.NullPointerException
        at org.mig.gchat.commands.AdminChatCommand.onCommand(AdminChatCommand.ja
va:26) ~[?:?]
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44) ~[spi
got-1.8.7.jar:git-Spigot-f928e7a-e91aed8]
        ... 15 more