[09:34:12 FATAL]: Error executing task
java.util.concurrent.ExecutionException: java.lang.NullPointerException
        at java.util.concurrent.FutureTask.report(FutureTask.java:122) ~[?:1.8.0_121]
        at java.util.concurrent.FutureTask.get(FutureTask.java:192) ~[?:1.8.0_121]
        at net.minecraft.server.v1_11_R1.SystemUtils.a(SourceFile:47) [hub.jar:git-Spigot-283de8b-aa522c9]
        at net.minecraft.server.v1_11_R1.MinecraftServer.D(MinecraftServer.java:747) [hub.jar:git-Spigot-283de8b-aa522c9]
        at net.minecraft.server.v1_11_R1.DedicatedServer.D(DedicatedServer.java:399) [hub.jar:git-Spigot-283de8b-aa522c9]
        at net.minecraft.server.v1_11_R1.MinecraftServer.C(MinecraftServer.java:678) [hub.jar:git-Spigot-283de8b-aa522c9]
        at net.minecraft.server.v1_11_R1.MinecraftServer.run(MinecraftServer.java:576) [hub.jar:git-Spigot-283de8b-aa522c9]
        at java.lang.Thread.run(Thread.java:745) [?:1.8.0_121]
Caused by: java.lang.NullPointerException
        at net.minecraft.server.v1_11_R1.PlayerConnection.a(PlayerConnection.java:438) ~[hub.jar:git-Spigot-283de8b-aa522c9]
        at net.minecraft.server.v1_11_R1.PacketPlayInTeleportAccept.a(SourceFile:31) ~[hub.jar:git-Spigot-283de8b-aa522c9]
        at net.minecraft.server.v1_11_R1.PacketPlayInTeleportAccept.a(SourceFile:8) ~[hub.jar:git-Spigot-283de8b-aa522c9]
        at net.minecraft.server.v1_11_R1.PlayerConnectionUtils$1.run(SourceFile:13) ~[hub.jar:git-Spigot-283de8b-aa522c9]
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) ~[?:1.8.0_121]
        at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[?:1.8.0_121]
        at net.minecraft.server.v1_11_R1.SystemUtils.a(SourceFile:46) ~[hub.jar:git-Spigot-283de8b-aa522c9]
        ... 5 more