error

gistfile1.txt

[16:31:10] [Netty Server IO #2/WARN]: [Essentials] Could not hide vanished players while handling org.bukkit.event.server.ServerListPingEvent
java.lang.UnsupportedOperationException: null
	at org.bukkit.event.server.ServerListPingEvent.iterator(ServerListPingEvent.java:144) ~[my.jar:git-Spigot-f56e2e7-4385562]
	at com.earth2me.essentials.EssentialsServerListener.onServerListPing(EssentialsServerListener.java:74) [EssentialsX-2.16.0.26.jar:?]
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_151]
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_151]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_151]
	at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_151]
	at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:305) [my.jar:git-Spigot-f56e2e7-4385562]
	at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) [my.jar:git-Spigot-f56e2e7-4385562]
	at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:500) [my.jar:git-Spigot-f56e2e7-4385562]
	at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:485) [my.jar:git-Spigot-f56e2e7-4385562]
	at org.bukkit.craftbukkit.v1_13_R2.event.CraftEventFactory.callServerListPingEvent(CraftEventFactory.java:612) [my.jar:git-Spigot-f56e2e7-4385562]
	at net.minecraft.server.v1_13_R2.LegacyPingHandler.channelRead(LegacyPingHandler.java:37) [my.jar:git-Spigot-f56e2e7-4385562]
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362) [my.jar:git-Spigot-f56e2e7-4385562]
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348) [my.jar:git-Spigot-f56e2e7-4385562]
	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340) [my.jar:git-Spigot-f56e2e7-4385562]
	at io.netty.handler.timeout.IdleStateHandler.channelRead(IdleStateHandler.java:286) [my.jar:git-Spigot-f56e2e7-4385562]
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362) [my.jar:git-Spigot-f56e2e7-4385562]
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348) [my.jar:git-Spigot-f56e2e7-4385562]
	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340) [my.jar:git-Spigot-f56e2e7-4385562]
	at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1434) [my.jar:git-Spigot-f56e2e7-4385562]
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362) [my.jar:git-Spigot-f56e2e7-4385562]
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348) [my.jar:git-Spigot-f56e2e7-4385562]
	at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:965) [my.jar:git-Spigot-f56e2e7-4385562]
	at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:163) [my.jar:git-Spigot-f56e2e7-4385562]
	at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:647) [my.jar:git-Spigot-f56e2e7-4385562]
	at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:582) [my.jar:git-Spigot-f56e2e7-4385562]
	at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:499) [my.jar:git-Spigot-f56e2e7-4385562]
	at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:461) [my.jar:git-Spigot-f56e2e7-4385562]
	at io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:884) [my.jar:git-Spigot-f56e2e7-4385562]
	at java.lang.Thread.run(Thread.java:748) [?:1.8.0_151]