> [15:18:49] [Server thread/ERROR]: Could not pass event PlayerJoinEvent to MCValidator v1.1-SNAPSHOT
org.bukkit.event.EventException: null
at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:320) ~[spigot-1.15.1.jar:git-Spigot-2ee05fe-d31f05f]
at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:70) ~[spigot-1.15.1.jar:git-Spigot-2ee05fe-d31f05f]
at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:529) ~[spigot-1.15.1.jar:git-Spigot-2ee05fe-d31f05f]
at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:514) ~[spigot-1.15.1.jar:git-Spigot-2ee05fe-d31f05f]
at net.minecraft.server.v1_15_R1.PlayerList.a(PlayerList.java:176) ~[spigot-1.15.1.jar:git-Spigot-2ee05fe-d31f05f]
at protocolsupport.zplatform.impl.spigot.network.handler.SpigotLoginListenerPlay.joinGame(SpigotLoginListenerPlay.java:138) ~[?:?]
at protocolsupport.protocol.packet.handler.AbstractLoginListenerPlay.joinWorld(AbstractLoginListenerPlay.java:143) ~[?:?]
at protocolsupport.protocol.packet.handler.AbstractLoginListenerPlay.lambda$finishLogin$1(AbstractLoginListenerPlay.java:88) ~[?:?]
at java.util.concurrent.FutureTask.run(FutureTask.java:266) [?:1.8.0_212]
at net.minecraft.server.v1_15_R1.MinecraftServer.b(MinecraftServer.java:1043) [spigot-1.15.1.jar:git-Spigot-2ee05fe-d31f05f]
at net.minecraft.server.v1_15_R1.DedicatedServer.b(DedicatedServer.java:393) [spigot-1.15.1.jar:git-Spigot-2ee05fe-d31f05f]
at net.minecraft.server.v1_15_R1.MinecraftServer.a(MinecraftServer.java:978) [spigot-1.15.1.jar:git-Spigot-2ee05fe-d31f05f]
at net.minecraft.server.v1_15_R1.MinecraftServer.run(MinecraftServer.java:823) [spigot-1.15.1.jar:git-Spigot-2ee05fe-d31f05f]
at java.lang.Thread.run(Thread.java:748) [?:1.8.0_212]
Caused by: java.lang.NullPointerException
at verify.brainsynder.bot.Bot.checkUsername(Bot.java:170) ~[?:?]
at verify.brainsynder.MCValidator.onJoin(MCValidator.java:164) ~[?:?]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_212]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_212]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_212]
at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_212]
at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:316) ~[spigot-1.15.1.jar:git-Spigot-2ee05fe-d31f05f]
... 13 more