✓ AvoidTheElectricity [MultiArena/BungeeCord] [SALE 25%] [1.8.3 - 1.12] Don't be electrified! 1.6.8

Awesome leak! But there are some mistakes! Please fix it D:
[Server thread/WARN]: [AvoidTheElectricity] Task #68 for AvoidTheElectricity v1.6.0 generated an exception
java.lang.IllegalArgumentException: Name cannot be null
at org.apache.commons.lang.Validate.notNull(Validate.java:192) ~[spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24]
at org.bukkit.craftbukkit.v1_8_R3.CraftServer.getWorld(CraftServer.java:1014) ~[spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24]
at org.bukkit.Bukkit.getWorld(Bukkit.java:496) ~[spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24]
at iimrramii.ef.Main.getSpawn(Main.java:125) ~[?:?]
at iimrramii.ef.Arena.start2(Arena.java:642) ~[?:?]
at iimrramii.ef.Arena$1.run(Arena.java:206) ~[?:?]
at org.bukkit.craftbukkit.v1_8_R3.scheduler.CraftTask.run(CraftTask.java:71) ~[spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24]
at org.bukkit.craftbukkit.v1_8_R3.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:350) [spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24]
at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:723) [spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24]
at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:374) [spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24]
at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:654) [spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24]
at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:557) [spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24]
at java.lang.Thread.run(Unknown Source) [?:1.8.0_171]