[21:50:42 INFO]: offline
[21:50:42 ERROR]: Could not pass event AsyncPlayerPreLoginEvent to SimplePrefix v2.3.5
org.bukkit.event.EventException
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:299) ~[spigot.jar:git-Spigot-1544]
        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[spigot.jar:git-Spigot-1544]
        at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:502) [spigot.jar:git-Spigot-1544]
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:484) [spigot.jar:git-Spigot-1544]
        at net.minecraft.server.v1_7_R4.ThreadPlayerLookupUUID.fireLoginEvents(ThreadPlayerLookupUUID.java:79) [spigot.jar:git-Spigot-1544]
        at net.minecraft.server.v1_7_R4.ThreadPlayerLookupUUID.run(ThreadPlayerLookupUUID.java:32) [spigot.jar:git-Spigot-1544]
Caused by: java.lang.NullPointerException
        at com.flabaliki.simpleprefix.SimplePrefix.onPreLogin(SimplePrefix.java:136) ~[?:?]
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.7.0_55]
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) ~[?:1.7.0_55]
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.7.0_55]
        at java.lang.reflect.Method.invoke(Method.java:606) ~[?:1.7.0_55]
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:296) ~[spigot.jar:git-Spigot-1544]
        ... 5 more