[23:46:28 WARN]: [PerWorldSpawn] Task #3769 for PerWorldSpawn v1.0.0 generated a
n exception
java.lang.NullPointerException
        at org.bukkit.craftbukkit.v1_8_R3.entity.CraftPlayer.teleport(CraftPlaye
r.java:460) ~[spigot.jar:git-Spigot-db6de12-18fbb24]
        at org.bukkit.craftbukkit.v1_8_R3.entity.CraftEntity.teleport(CraftEntit
y.java:226) ~[spigot.jar:git-Spigot-db6de12-18fbb24]
        at com.gianlucamc.perworldspawn.commands.Spawn$1.run(Spawn.java:51) ~[?:
?]
        at org.bukkit.craftbukkit.v1_8_R3.scheduler.CraftTask.run(CraftTask.java
:71) ~[spigot.jar:git-Spigot-db6de12-18fbb24]
        at org.bukkit.craftbukkit.v1_8_R3.scheduler.CraftScheduler.mainThreadHea
rtbeat(CraftScheduler.java:350) [spigot.jar:git-Spigot-db6de12-18fbb24]
        at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:7
23) [spigot.jar:git-Spigot-db6de12-18fbb24]
        at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:3
74) [spigot.jar:git-Spigot-db6de12-18fbb24]
        at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:6
54) [spigot.jar:git-Spigot-db6de12-18fbb24]
        at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java
:557) [spigot.jar:git-Spigot-db6de12-18fbb24]
        at java.lang.Thread.run(Unknown Source) [?:1.8.0_131]