[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_77]
at java.util.concurrent.FutureTask.get(FutureTask.java:192) ~[?:1.8.0_77]
at net.minecraft.server.v1_9_R1.SystemUtils.a(SourceFile:46) [spigot-1.9.2.jar:git-Spigot-a1b8bf3-f01861f]
at net.minecraft.server.v1_9_R1.MinecraftServer.D(MinecraftServer.java:721) [spigot-1.9.2.jar:git-Spigot-a1b8bf3-f01861f]
at net.minecraft.server.v1_9_R1.DedicatedServer.D(DedicatedServer.java:400) [spigot-1.9.2.jar:git-Spigot-a1b8bf3-f01861f]
at net.minecraft.server.v1_9_R1.MinecraftServer.C(MinecraftServer.java:660) [spigot-1.9.2.jar:git-Spigot-a1b8bf3-f01861f]
at net.minecraft.server.v1_9_R1.MinecraftServer.run(MinecraftServer.java:559) [spigot-1.9.2.jar:git-Spigot-a1b8bf3-f01861f]
at java.lang.Thread.run(Thread.java:745) [?:1.8.0_77]
Caused by: java.lang.NullPointerException
at net.minecraft.server.v1_9_R1.StructureGenerator.a(StructureGenerator.java:201) ~[spigot-1.9.2.jar:git-Spigot-a1b8bf3-f01861f]
at net.minecraft.server.v1_9_R1.WorldGenStronghold.c(SourceFile:96) ~[spigot-1.9.2.jar:git-Spigot-a1b8bf3-f01861f]
at net.minecraft.server.v1_9_R1.WorldGenStronghold.getNearestGeneratedFeature(SourceFile:58) ~[spigot-1.9.2.jar:git-Spigot-a1b8bf3-f01861f]
at net.minecraft.server.v1_9_R1.ChunkProviderGenerate.findNearestMapFeature(SourceFile:526) ~[spigot-1.9.2.jar:git-Spigot-a1b8bf3-f01861f]
at org.bukkit.craftbukkit.v1_9_R1.generator.NormalChunkGenerator.findNearestMapFeature(NormalChunkGenerator.java:56) ~[spigot-1.9.2.jar:git-Spigot-a1b8bf3-f01861f]
at net.minecraft.server.v1_9_R1.ChunkProviderServer.a(ChunkProviderServer.java:339) ~[spigot-1.9.2.jar:git-Spigot-a1b8bf3-f01861f]
at net.minecraft.server.v1_9_R1.ItemEnderEye.a(SourceFile:82) ~[spigot-1.9.2.jar:git-Spigot-a1b8bf3-f01861f]
at net.minecraft.server.v1_9_R1.ItemStack.a(ItemStack.java:244) ~[spigot-1.9.2.jar:git-Spigot-a1b8bf3-f01861f]
at net.minecraft.server.v1_9_R1.PlayerInteractManager.a(PlayerInteractManager.java:385) ~[spigot-1.9.2.jar:git-Spigot-a1b8bf3-f01861f]
at net.minecraft.server.v1_9_R1.PlayerConnection.a(PlayerConnection.java:958) ~[spigot-1.9.2.jar:git-Spigot-a1b8bf3-f01861f]
at net.minecraft.server.v1_9_R1.PacketPlayInBlockPlace.a(PacketPlayInBlockPlace.java:27) ~[spigot-1.9.2.jar:git-Spigot-a1b8bf3-f01861f]
at net.minecraft.server.v1_9_R1.PacketPlayInBlockPlace.a(PacketPlayInBlockPlace.java:1) ~[spigot-1.9.2.jar:git-Spigot-a1b8bf3-f01861f]
at net.minecraft.server.v1_9_R1.PlayerConnectionUtils$1.run(SourceFile:13) ~[spigot-1.9.2.jar:git-Spigot-a1b8bf3-f01861f]
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) ~[?:1.8.0_77]
at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[?:1.8.0_77]
at net.minecraft.server.v1_9_R1.SystemUtils.a(SourceFile:45) ~[spigot-1.9.2.jar:git-Spigot-a1b8bf3-f01861f]