[06:43:21] [Server thread/FATAL]: Error executing task
java.util.concurrent.ExecutionException: java.lang.NullPointerException
	at java.util.concurrent.FutureTask.report(FutureTask.java:122) ~[?:1.8.0_91]
	at java.util.concurrent.FutureTask.get(FutureTask.java:192) ~[?:1.8.0_91]
	at net.minecraft.server.v1_10_R1.SystemUtils.a(SourceFile:46) [craftbukkit.jar:git-Spigot-687a019-75f99ec]
	at net.minecraft.server.v1_10_R1.MinecraftServer.D(MinecraftServer.java:733) [craftbukkit.jar:git-Spigot-687a019-75f99ec]
	at net.minecraft.server.v1_10_R1.DedicatedServer.D(DedicatedServer.java:399) [craftbukkit.jar:git-Spigot-687a019-75f99ec]
	at net.minecraft.server.v1_10_R1.MinecraftServer.C(MinecraftServer.java:672) [craftbukkit.jar:git-Spigot-687a019-75f99ec]
	at net.minecraft.server.v1_10_R1.MinecraftServer.run(MinecraftServer.java:571) [craftbukkit.jar:git-Spigot-687a019-75f99ec]
	at java.lang.Thread.run(Thread.java:745) [?:1.8.0_91]
Caused by: java.lang.NullPointerException
	at net.minecraft.server.v1_10_R1.PlayerConnection.a(PlayerConnection.java:439) ~[craftbukkit.jar:git-Spigot-687a019-75f99ec]
	at net.minecraft.server.v1_10_R1.PacketPlayInTeleportAccept.a(SourceFile:31) ~[craftbukkit.jar:git-Spigot-687a019-75f99ec]
	at net.minecraft.server.v1_10_R1.PacketPlayInTeleportAccept.a(SourceFile:8) ~[craftbukkit.jar:git-Spigot-687a019-75f99ec]
	at net.minecraft.server.v1_10_R1.PlayerConnectionUtils$1.run(SourceFile:13) ~[craftbukkit.jar:git-Spigot-687a019-75f99ec]
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) ~[?:1.8.0_91]
	at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[?:1.8.0_91]
	at net.minecraft.server.v1_10_R1.SystemUtils.a(SourceFile:45) ~[craftbukkit.jar:git-Spigot-687a019-75f99ec]
	... 5 more