[23:43:36 ERROR]: Could not pass event PlayerQuitEvent to McCombatLevel v1.7.2
org.bukkit.event.EventException
at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.ja
va:302) ~[spigot1627.jar:git-Spigot-1627]
at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.jav
a:62) ~[spigot1627.jar:git-Spigot-1627]
at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.j
ava:502) [spigot1627.jar:git-Spigot-1627]
at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.j
ava:487) [spigot1627.jar:git-Spigot-1627]
at net.minecraft.server.v1_7_R4.PlayerList.disconnect(PlayerList.java:32

1. [spigot1627.jar:git-Spigot-1627]
   at net.minecraft.server.v1_7_R4.PlayerConnection.a(PlayerConnection.java
   :738) [spigot1627.jar:git-Spigot-1627]
   at net.minecraft.server.v1_7_R4.ServerConnection.c(ServerConnection.java
   :77) [spigot1627.jar:git-Spigot-1627]
   at net.minecraft.server.v1_7_R4.MinecraftServer.v(MinecraftServer.java:7
2. [spigot1627.jar:git-Spigot-1627]
   at net.minecraft.server.v1_7_R4.DedicatedServer.v(DedicatedServer.java:2
3. [spigot1627.jar:git-Spigot-1627]
   at net.minecraft.server.v1_7_R4.MinecraftServer.u(MinecraftServer.java:5
4. [spigot1627.jar:git-Spigot-1627]
   at net.minecraft.server.v1_7_R4.MinecraftServer.run(MinecraftServer.java
   :490) [spigot1627.jar:git-Spigot-1627]
   at net.minecraft.server.v1_7_R4.ThreadServerApplication.run(SourceFile:6
5. [spigot1627.jar:git-Spigot-1627]
   Caused by: java.lang.NullPointerException
   at com.gmail.mrphpfan.mccombatlevel.McCombatLevel.removeCachedLevels(McC
   ombatLevel.java:141) ~[?:?]
   at com.gmail.mrphpfan.mccombatlevel.PlayerListener.onPlayerLogout(Player
   Listener.java:50) ~[?:?]
   at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0
   _31]
   at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0
   _31]
   at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1
   .8.0_31]
   at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_31]
   at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.ja
   va:298) ~[spigot1627.jar:git-Spigot-1627]
   ... 11 more