SkywarsReloaded Error

[08:35:09 ERROR]: Error occurred while enabling SkyWarsReloaded v2.8 (Is it up to date?)
java.lang.NullPointerException
        at com.walrusone.skywars.utilities.LoggerFilter.isLoggable(LoggerFilter.java:10) ~[?:?]
        at java.util.logging.Logger.log(Logger.java:724) [?:1.8.0_72]
        at java.util.logging.Logger.doLog(Logger.java:765) [?:1.8.0_72]
        at java.util.logging.Logger.log(Logger.java:875) [?:1.8.0_72]
        at org.bukkit.craftbukkit.v1_8_R3.CraftServer.unloadWorld(CraftServer.java:973) ~[spigot-1.8.8.jar:git-Spigot-6c9b0a1-de5c261]
        at com.walrusone.skywars.controllers.WorldController.unloadWorld(WorldController.java:135) ~[?:?]
        at com.walrusone.skywars.controllers.WorldController.deleteWorld(WorldController.java:169) ~[?:?]
        at com.walrusone.skywars.controllers.MapController.registerMap(MapController.java:49) ~[?:?]
        at com.walrusone.skywars.controllers.MapController.<init>(MapController.java:27) ~[?:?]
        at com.walrusone.skywars.SkyWarsReloaded.onEnable(SkyWarsReloaded.java:150) ~[?:?]
        at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:321) ~[spigot-1.8.8.jar:git-Spigot-6c9b0a1-de5c261]
        at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:340) [spigot-1.8.8.jar:git-Spigot-6c9b0a1-de5c261]
        at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:405) [spigot-1.8.8.jar:git-Spigot-6c9b0a1-de5c261]
        at org.bukkit.craftbukkit.v1_8_R3.CraftServer.loadPlugin(CraftServer.java:356) [spigot-1.8.8.jar:git-Spigot-6c9b0a1-de5c261]
        at org.bukkit.craftbukkit.v1_8_R3.CraftServer.enablePlugins(CraftServer.java:316) [spigot-1.8.8.jar:git-Spigot-6c9b0a1-de5c261]
        at net.minecraft.server.v1_8_R3.MinecraftServer.s(MinecraftServer.java:414) [spigot-1.8.8.jar:git-Spigot-6c9b0a1-de5c261]
        at net.minecraft.server.v1_8_R3.MinecraftServer.k(MinecraftServer.java:378) [spigot-1.8.8.jar:git-Spigot-6c9b0a1-de5c261]
        at net.minecraft.server.v1_8_R3.MinecraftServer.a(MinecraftServer.java:333) [spigot-1.8.8.jar:git-Spigot-6c9b0a1-de5c261]
        at net.minecraft.server.v1_8_R3.DedicatedServer.init(DedicatedServer.java:263) [spigot-1.8.8.jar:git-Spigot-6c9b0a1-de5c261]
        at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:524) [spigot-1.8.8.jar:git-Spigot-6c9b0a1-de5c261]
        at java.lang.Thread.run(Thread.java:745) [?:1.8.0_72]