[18:31:48 ERROR]: Could not pass event PlayerCommandPreprocessEvent to BetterAlias v1.5.2
org.bukkit.event.EventException
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:305) ~[spigot.jar:git-Spigot-2ec6f06-7722428]
        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[spigot.jar:git-Spigot-2ec6f06-7722428]
        at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:502) [spigot.jar:git-Spigot-2ec6f06-7722428]
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:487) [spigot.jar:git-Spigot-2ec6f06-7722428]
        at net.minecraft.server.v1_8_R2.PlayerConnection.handleCommand(PlayerConnection.java:1131) [spigot.jar:git-Spigot-2ec6f06-7722428]
        at net.minecraft.server.v1_8_R2.PlayerConnection.a(PlayerConnection.java:974) [spigot.jar:git-Spigot-2ec6f06-7722428]
        at net.minecraft.server.v1_8_R2.PacketPlayInChat.a(PacketPlayInChat.java:45) [spigot.jar:git-Spigot-2ec6f06-7722428]
        at net.minecraft.server.v1_8_R2.PacketPlayInChat.a(PacketPlayInChat.java:1) [spigot.jar:git-Spigot-2ec6f06-7722428]
        at net.minecraft.server.v1_8_R2.PlayerConnectionUtils$1.run(SourceFile:13) [spigot.jar:git-Spigot-2ec6f06-7722428]
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471) [?:1.7.0_75]
        at java.util.concurrent.FutureTask.run(FutureTask.java:262) [?:1.7.0_75]
        at net.minecraft.server.v1_8_R2.SystemUtils.a(SourceFile:60) [spigot.jar:git-Spigot-2ec6f06-7722428]
        at net.minecraft.server.v1_8_R2.MinecraftServer.A(MinecraftServer.java:712) [spigot.jar:git-Spigot-2ec6f06-7722428]
        at net.minecraft.server.v1_8_R2.DedicatedServer.A(DedicatedServer.java:368) [spigot.jar:git-Spigot-2ec6f06-7722428]
        at net.minecraft.server.v1_8_R2.MinecraftServer.z(MinecraftServer.java:651) [spigot.jar:git-Spigot-2ec6f06-7722428]
        at net.minecraft.server.v1_8_R2.MinecraftServer.run(MinecraftServer.java:554) [spigot.jar:git-Spigot-2ec6f06-7722428]
        at java.lang.Thread.run(Thread.java:745) [?:1.7.0_75]
Caused by: java.lang.ArrayIndexOutOfBoundsException: -1
        at java.util.ArrayList.elementData(ArrayList.java:400) ~[?:1.7.0_75]
        at java.util.ArrayList.get(ArrayList.java:413) ~[?:1.7.0_75]
        at com.ne0nx3r0.betteralias.alias.AliasManager.sendAliasCommands(AliasManager.java:255) ~[?:?]
        at com.ne0nx3r0.betteralias.listener.BetterAliasCommandListener.onPlayerCommandPreprocess(BetterAliasCommandListener.java:41) ~[?:?]
        at sun.reflect.GeneratedMethodAccessor42.invoke(Unknown Source) ~[?:?]
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.7.0_75]
        at java.lang.reflect.Method.invoke(Method.java:606) ~[?:1.7.0_75]
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:301) ~[spigot.jar:git-Spigot-2ec6f06-7722428]
        ... 16 more