Shitty eventexception

09.12 18:02:02 [Server] ERROR Could not pass event PlayerDeathEvent to KillCounter v1.0-RELEASE
09.12 18:02:02 [Server] INFO org.bukkit.event.EventException
09.12 18:02:02 [Server] INFO at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:302) ~[spigot.jar:git-PaperSpigot-43]
09.12 18:02:02 [Server] INFO at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[spigot.jar:git-PaperSpigot-43]
09.12 18:02:02 [Server] INFO at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:509) [spigot.jar:git-PaperSpigot-43]
09.12 18:02:02 [Server] INFO at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:494) [spigot.jar:git-PaperSpigot-43]
09.12 18:02:02 [Server] INFO at org.bukkit.craftbukkit.v1_7_R4.event.CraftEventFactory.callPlayerDeathEvent(CraftEventFactory.java:397) [spigot.jar:git-PaperSpigot-43]
09.12 18:02:02 [Server] INFO at net.minecraft.server.v1_7_R4.EntityPlayer.die(EntityPlayer.java:386) [spigot.jar:git-PaperSpigot-43]
09.12 18:02:02 [Server] INFO at org.bukkit.craftbukkit.v1_7_R4.entity.CraftLivingEntity.setHealth(CraftLivingEntity.java:85) [spigot.jar:git-PaperSpigot-43]
09.12 18:02:02 [Server] INFO at com.earth2me.essentials.commands.Commandkill.updatePlayer(Commandkill.java:47) [Essentials.jar:?]
09.12 18:02:02 [Server] INFO at com.earth2me.essentials.commands.EssentialsLoopCommand.loopOnlinePlayers(EssentialsLoopCommand.java:111) [Essentials.jar:?]
09.12 18:02:02 [Server] INFO at com.earth2me.essentials.commands.Commandkill.run(Commandkill.java:26) [Essentials.jar:?]
09.12 18:02:02 [Server] INFO at com.earth2me.essentials.commands.EssentialsCommand.run(EssentialsCommand.java:155) [Essentials.jar:?]
09.12 18:02:02 [Server] INFO at com.earth2me.essentials.commands.EssentialsCommand.run(EssentialsCommand.java:149) [Essentials.jar:?]
09.12 18:02:02 [Server] INFO at com.earth2me.essentials.Essentials.onCommandEssentials(Essentials.java:505) [Essentials.jar:?]
09.12 18:02:02 [Server] INFO at com.earth2me.essentials.Essentials.onCommand(Essentials.java:380) [Essentials.jar:?]
09.12 18:02:02 [Server] INFO at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44) [spigot.jar:git-PaperSpigot-43]
09.12 18:02:02 [Server] INFO at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:181) [spigot.jar:git-PaperSpigot-43]
09.12 18:02:02 [Server] INFO at org.bukkit.craftbukkit.v1_7_R4.CraftServer.dispatchCommand(CraftServer.java:766) [spigot.jar:git-PaperSpigot-43]
09.12 18:02:02 [Server] INFO at net.minecraft.server.v1_7_R4.PlayerConnection.handleCommand(PlayerConnection.java:1044) [spigot.jar:git-PaperSpigot-43]
09.12 18:02:02 [Server] INFO at net.minecraft.server.v1_7_R4.PlayerConnection.a(PlayerConnection.java:881) [spigot.jar:git-PaperSpigot-43]
09.12 18:02:02 [Server] INFO at net.minecraft.server.v1_7_R4.PacketPlayInChat.a(PacketPlayInChat.java:28) [spigot.jar:git-PaperSpigot-43]
09.12 18:02:02 [Server] INFO at net.minecraft.server.v1_7_R4.PacketPlayInChat.handle(PacketPlayInChat.java:65) [spigot.jar:git-PaperSpigot-43]
09.12 18:02:02 [Server] INFO at net.minecraft.server.v1_7_R4.NetworkManager.a(NetworkManager.java:189) [spigot.jar:git-PaperSpigot-43]
09.12 18:02:02 [Server] INFO at net.minecraft.server.v1_7_R4.ServerConnection.c(ServerConnection.java:81) [spigot.jar:git-PaperSpigot-43]
09.12 18:02:02 [Server] INFO at net.minecraft.server.v1_7_R4.MinecraftServer.v(MinecraftServer.java:789) [spigot.jar:git-PaperSpigot-43]
09.12 18:02:02 [Server] INFO at net.minecraft.server.v1_7_R4.DedicatedServer.v(DedicatedServer.java:307) [spigot.jar:git-PaperSpigot-43]
09.12 18:02:02 [Server] INFO at net.minecraft.server.v1_7_R4.MinecraftServer.u(MinecraftServer.java:638) [spigot.jar:git-PaperSpigot-43]
09.12 18:02:02 [Server] INFO at net.minecraft.server.v1_7_R4.MinecraftServer.run(MinecraftServer.java:544) [spigot.jar:git-PaperSpigot-43]