Помогите Ошибка какая та

Could not pass event PlayerJoinEvent to AirDrops v1.0
org.bukkit.event.EventException: null
at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:306) ~[spigot.jar:git-Spigot-596221b-9a1fc1e]
at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[spigot.jar:git-Spigot-596221b-9a1fc1e]
at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:499) [spigot.jar:git-Spigot-596221b-9a1fc1e]
at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:484) [spigot.jar:git-Spigot-596221b-9a1fc1e]
at net.minecraft.server.v1_12_R1.PlayerList.onPlayerJoin(PlayerList.java:346) [spigot.jar:git-Spigot-596221b-9a1fc1e]
at net.minecraft.server.v1_12_R1.PlayerList.a(PlayerList.java:166) [spigot.jar:git-Spigot-596221b-9a1fc1e]
at net.minecraft.server.v1_12_R1.LoginListener.b(LoginListener.java:159) [spigot.jar:git-Spigot-596221b-9a1fc1e]
at net.minecraft.server.v1_12_R1.LoginListener.e(LoginListener.java:57) [spigot.jar:git-Spigot-596221b-9a1fc1e]
at net.minecraft.server.v1_12_R1.NetworkManager.a(NetworkManager.java:233) [spigot.jar:git-Spigot-596221b-9a1fc1e]
at net.minecraft.server.v1_12_R1.ServerConnection.c(ServerConnection.java:140) [spigot.jar:git-Spigot-596221b-9a1fc1e]
at net.minecraft.server.v1_12_R1.MinecraftServer.D(MinecraftServer.java:842) [spigot.jar:git-Spigot-596221b-9a1fc1e]
at net.minecraft.server.v1_12_R1.DedicatedServer.D(DedicatedServer.java:405) [spigot.jar:git-Spigot-596221b-9a1fc1e]
at net.minecraft.server.v1_12_R1.MinecraftServer.C(MinecraftServer.java:678) [spigot.jar:git-Spigot-596221b-9a1fc1e]
at net.minecraft.server.v1_12_R1.MinecraftServer.run(MinecraftServer.java:576) [spigot.jar:git-Spigot-596221b-9a1fc1e]
at java.lang.Thread.run(Thread.java:748) [?:1.8.0_242]
Caused by: java.lang.NullPointerException
at ru.stonlex.airdrop.listener.AirdropListener.onJoin(AirdropListener.java:37) ~[?:?]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_242]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_242]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_242]
at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_242]
at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:302) ~[spigot.jar:git-Spigot-596221b-9a1fc1e]
... 14 more

 

Что то с евентом