[23:04:36 WARN]: [Skywars] Task #96 for Skywars v2.1 generated an exception
java.lang.NullPointerException
        at org.bukkit.Location.getBlock(Location.java:87) ~[spigot-1.8.8.jar:git-Spigot-21fe707-e1ebe52]
        at me.wazup.skywars.Arena.updateItem(Arena.java:169) ~[?:?]
        at me.wazup.skywars.Skywars.updateArenasInventory(Skywars.java:1727) ~[?:?]
        at me.wazup.skywars.Skywars$11.run(Skywars.java:1384) ~[?:?]
        at org.bukkit.craftbukkit.v1_8_R3.scheduler.CraftTask.run(CraftTask.java:71) ~[spigot-1.8.8.jar:git-Spigot-21fe707-e1ebe52]
        at org.bukkit.craftbukkit.v1_8_R3.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:350) [spigot-1.8.8.jar:git-Spigot-21fe707-e1ebe52]
        at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:723) [spigot-1.8.8.jar:git-Spigot-21fe707-e1ebe52]
        at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:374) [spigot-1.8.8.jar:git-Spigot-21fe707-e1ebe52]
        at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:654) [spigot-1.8.8.jar:git-Spigot-21fe707-e1ebe52]
        at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:557) [spigot-1.8.8.jar:git-Spigot-21fe707-e1ebe52]
        at java.lang.Thread.run(Thread.java:745) [?:1.8.0_72]