[13:47:59 ERROR]: Could not pass event PlayerJoinEvent to Deliver v0.1.2
org.bukkit.event.EventException
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:302) ~[ragespigot-1.8.8-R0.1-SNAPSHOT.jar:git-PaperSpigot-1f7d532]
        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[ragespigot-1.8.8-R0.1-SNAPSHOT.jar:git-PaperSpigot-1f7d532]
        at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:509) [ragespigot-1.8.8-R0.1-SNAPSHOT.jar:git-PaperSpigot-1f7d532]
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:494) [ragespigot-1.8.8-R0.1-SNAPSHOT.jar:git-PaperSpigot-1f7d532]
        at net.minecraft.server.v1_7_R4.PlayerList.c(PlayerList.java:300) [ragespigot-1.8.8-R0.1-SNAPSHOT.jar:git-PaperSpigot-1f7d532]
        at net.minecraft.server.v1_7_R4.PlayerList.a(PlayerList.java:185) [ragespigot-1.8.8-R0.1-SNAPSHOT.jar:git-PaperSpigot-1f7d532]
        at net.minecraft.server.v1_7_R4.LoginListener.c(LoginListener.java:119) [ragespigot-1.8.8-R0.1-SNAPSHOT.jar:git-PaperSpigot-1f7d532]
        at net.minecraft.server.v1_7_R4.LoginListener.a(LoginListener.java:44) [ragespigot-1.8.8-R0.1-SNAPSHOT.jar:git-PaperSpigot-1f7d532]
        at net.minecraft.server.v1_7_R4.NetworkManager.a(NetworkManager.java:192) [ragespigot-1.8.8-R0.1-SNAPSHOT.jar:git-PaperSpigot-1f7d532]
        at net.minecraft.server.v1_7_R4.ServerConnection.c(ServerConnection.java:81) [ragespigot-1.8.8-R0.1-SNAPSHOT.jar:git-PaperSpigot-1f7d532]
        at net.minecraft.server.v1_7_R4.MinecraftServer.v(MinecraftServer.java:795) [ragespigot-1.8.8-R0.1-SNAPSHOT.jar:git-PaperSpigot-1f7d532]
        at net.minecraft.server.v1_7_R4.DedicatedServer.v(DedicatedServer.java:307) [ragespigot-1.8.8-R0.1-SNAPSHOT.jar:git-PaperSpigot-1f7d532]
        at net.minecraft.server.v1_7_R4.MinecraftServer.u(MinecraftServer.java:643) [ragespigot-1.8.8-R0.1-SNAPSHOT.jar:git-PaperSpigot-1f7d532]
        at net.minecraft.server.v1_7_R4.MinecraftServer.run(MinecraftServer.java:549) [ragespigot-1.8.8-R0.1-SNAPSHOT.jar:git-PaperSpigot-1f7d532]
        at net.minecraft.server.v1_7_R4.ThreadServerApplication.run(SourceFile:628) [ragespigot-1.8.8-R0.1-SNAPSHOT.jar:git-PaperSpigot-1f7d532]
Caused by: java.lang.NullPointerException
        at me.siaco.deliver.events.join.Join.onJoin(Join.java:39) ~[?:?]
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_191]
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_191]
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_191]
        at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_191]
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:298) ~[ragespigot-1.8.8-R0.1-SNAPSHOT.jar:git-PaperSpigot-1f7d532]
        ... 14 more