[16:21:23 ERROR]: Could not pass event AsyncPlayerChatEvent to ChatAlert v1.5.1
org.bukkit.event.EventException
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.ja
va:320) ~[spigot-1.7.2-R0.3-SNAPSHOT.jar:git-Spigot-1307]
        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.jav
a:62) ~[spigot-1.7.2-R0.3-SNAPSHOT.jar:git-Spigot-1307]
        at org.bukkit.plugin.TimedRegisteredListener.callEvent(TimedRegisteredLi
stener.java:30) ~[spigot-1.7.2-R0.3-SNAPSHOT.jar:git-Spigot-1307]
        at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.j
ava:482) [spigot-1.7.2-R0.3-SNAPSHOT.jar:git-Spigot-1307]
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.j
ava:464) [spigot-1.7.2-R0.3-SNAPSHOT.jar:git-Spigot-1307]
        at net.minecraft.server.v1_7_R1.PlayerConnection.chat(PlayerConnection.j
ava:881) [spigot-1.7.2-R0.3-SNAPSHOT.jar:git-Spigot-1307]
        at net.minecraft.server.v1_7_R1.PlayerConnection.a(PlayerConnection.java
:831) [spigot-1.7.2-R0.3-SNAPSHOT.jar:git-Spigot-1307]
        at net.minecraft.server.v1_7_R1.PacketPlayInChat.a(PacketPlayInChat.java
:28) [spigot-1.7.2-R0.3-SNAPSHOT.jar:git-Spigot-1307]
        at net.minecraft.server.v1_7_R1.PacketPlayInChat$1.run(PacketPlayInChat.
java:59) [spigot-1.7.2-R0.3-SNAPSHOT.jar:git-Spigot-1307]
        at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) [
?:1.7.0_51]
        at java.util.concurrent.FutureTask.run(Unknown Source) [?:1.7.0_51]
        at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) [?:
1.7.0_51]
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) [?
:1.7.0_51]
        at java.lang.Thread.run(Unknown Source) [?:1.7.0_51]
Caused by: java.lang.NullPointerException
        at me.jacklin213.chatalert.ChatListener.getEssNickname(ChatListener.java
:234) ~[?:?]
        at me.jacklin213.chatalert.ChatListener.onTag(ChatListener.java:68) ~[?:
?]
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.7.0
_51]
        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.7.0
_51]
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1
.7.0_51]
        at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.7.0_51]
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.ja
va:318) ~[spigot-1.7.2-R0.3-SNAPSHOT.jar:git-Spigot-1307]
        ... 13 more