Could not pass event AsyncPlayerChatEvent to Essentials v2.0.1-b499
org.bukkit.event.EventException
at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:310) ~[gbinvl_minecraft_spigot_1_9.jar:git-Spigot-3104eb1-daf4514]
at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[gbinvl_minecraft_spigot_1_9.jar:git-Spigot-3104eb1-daf4514]
at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:502) [gbinvl_minecraft_spigot_1_9.jar:git-Spigot-3104eb1-daf4514]
at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:484) [gbinvl_minecraft_spigot_1_9.jar:git-Spigot-3104eb1-daf4514]
at net.minecraft.server.v1_9_R1.PlayerConnection.chat(PlayerConnection.java:1264) [gbinvl_minecraft_spigot_1_9.jar:git-Spigot-3104eb1-daf4514]
at net.minecraft.server.v1_9_R1.PlayerConnection.a(PlayerConnection.java:1202) [gbinvl_minecraft_spigot_1_9.jar:git-Spigot-3104eb1-daf4514]
at net.minecraft.server.v1_9_R1.PacketPlayInChat$1.run(PacketPlayInChat.java:39) [gbinvl_minecraft_spigot_1_9.jar:git-Spigot-3104eb1-daf4514]
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [?:1.8.0_45-internal]
at java.util.concurrent.FutureTask.run(FutureTask.java:266) [?:1.8.0_45-internal]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [?:1.8.0_45-internal]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [?:1.8.0_45-internal]
at java.lang.Thread.run(Thread.java:745) [?:1.8.0_45-internal]
Caused by: java.lang.NullPointerException
at net.milkbowl.vault.chat.plugins.Chat_GroupManager.getPlayerPrefix(Chat_GroupManager.java:271) ~[?:?]
at net.milkbowl.vault.chat.Chat.getPlayerPrefix(Chat.java:67) ~[?:?]
at net.milkbowl.vault.chat.Chat.getPlayerPrefix(Chat.java:91) ~[?:?]
at com.earth2me.essentials.perm.impl.AbstractVaultHandler.getPrefix(AbstractVaultHandler.java:48) ~[?:?]
at com.earth2me.essentials.perm.PermissionsHandler.getPrefix(PermissionsHandler.java:68) ~[?:?]
at com.earth2me.essentials.User.getNick(User.java:312) ~[?:?]
at com.earth2me.essentials.User.getNick(User.java:281) ~[?:?]
at com.earth2me.essentials.User.setDisplayNick(User.java:341) ~[?:?]
at com.earth2me.essentials.EssentialsPlayerListener.onPlayerChat(EssentialsPlayerListener.java:88) ~[?:?]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_45-internal]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_45-internal]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_45-internal]
at java.lang.reflect.Method.invoke(Method.java:497) ~[?:1.8.0_45-internal]
at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:306) ~[gbinvl_minecraft_spigot_1_9.jar:git-Spigot-3104eb1-daf4514]
... 11 more