org.bukkit.command.CommandException: Unhandled exception exe

[19:16:18] [Async Chat Thread - #87/INFO]: [FactionChat] FACTION|kayvaan0shrike: t est home
[19:16:20] [Server thread/INFO]: BubbleGum772 issued server command: /kit cool
[19:16:20] [Server thread/INFO]: [KitPlugin] Deducted $300 from BubbleGum772
[19:16:21] [Server thread/INFO]: AwaaX issued server command: /mw unload Jeux
[19:16:21] [Server thread/INFO]: [MultiWorld] AwaaX: The unloading of the world Jeux is started!
[19:16:21] [Server thread/ERROR]: null
org.bukkit.command.CommandException: Unhandled exception executing command 'mw' in plugin MultiWorld v5.1.2
	at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46) ~[1server.jar:git-Spigot-1387]
	at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:180) ~[1server.jar:git-Spigot-1387]
	at org.bukkit.craftbukkit.v1_7_R2.CraftServer.dispatchCommand(CraftServer.java:719) ~[1server.jar:git-Spigot-1387]
	at net.minecraft.server.v1_7_R2.PlayerConnection.handleCommand(PlayerConnection.java:984) [1server.jar:git-Spigot-1387]
	at net.minecraft.server.v1_7_R2.PlayerConnection.a(PlayerConnection.java:829) [1server.jar:git-Spigot-1387]
	at net.minecraft.server.v1_7_R2.PacketPlayInChat.a(PacketPlayInChat.java:28) [1server.jar:git-Spigot-1387]
	at net.minecraft.server.v1_7_R2.PacketPlayInChat.handle(PacketPlayInChat.java:65) [1server.jar:git-Spigot-1387]
	at net.minecraft.server.v1_7_R2.NetworkManager.a(NetworkManager.java:148) [1server.jar:git-Spigot-1387]
	at net.minecraft.server.v1_7_R2.ServerConnection.c(ServerConnection.java:77) [1server.jar:git-Spigot-1387]
	at net.minecraft.server.v1_7_R2.MinecraftServer.v(MinecraftServer.java:705) [1server.jar:git-Spigot-1387]
	at net.minecraft.server.v1_7_R2.DedicatedServer.v(DedicatedServer.java:273) [1server.jar:git-Spigot-1387]
	at net.minecraft.server.v1_7_R2.MinecraftServer.u(MinecraftServer.java:568) [1server.jar:git-Spigot-1387]
	at net.minecraft.server.v1_7_R2.MinecraftServer.run(MinecraftServer.java:474) [1server.jar:git-Spigot-1387]
	at net.minecraft.server.v1_7_R2.ThreadServerApplication.run(SourceFile:618) [1server.jar:git-Spigot-1387]
Caused by: java.lang.NullPointerException
	at com.lenis0012.bukkit.ls.CommandFilter.isLoggable(CommandFilter.java:21) ~[?:?]
	at java.util.logging.Logger.log(Logger.java:603) [?:1.7.0_55]
	at java.util.logging.Logger.doLog(Logger.java:641) [?:1.7.0_55]
	at java.util.logging.Logger.log(Logger.java:730) [?:1.7.0_55]
	at org.bukkit.craftbukkit.v1_7_R2.CraftServer.unloadWorld(CraftServer.java:1019) ~[1server.jar:git-Spigot-1387]
	at org.bukkit.craftbukkit.v1_7_R2.CraftServer.unloadWorld(CraftServer.java:983) ~[1server.jar:git-Spigot-1387]
	at org.bukkit.Bukkit.unloadWorld(Bukkit.java:242) ~[1server.jar:git-Spigot-1387]
	at multiworld.data.WorldManager.unloadWorld(WorldManager.java:306) ~[?:?]
	at multiworld.data.WorldHandler.unloadWorld(WorldHandler.java:79) ~[?:?]
	at multiworld.command.world.UnloadWorldCommand.runCommand(UnloadWorldCommand.java:52) ~[?:?]
	at multiworld.command.Command.excute(Command.java:54) ~[?:?]
	at multiworld.command.CommandMap.parseCommand(CommandMap.java:36) ~[?:?]
	at multiworld.command.CommandMap.runCommand(CommandMap.java:66) ~[?:?]
	at multiworld.command.Command.excute(Command.java:54) ~[?:?]
	at multiworld.MultiWorldPlugin.pushCommandStack(MultiWorldPlugin.java:221) ~[?:?]
	at multiworld.MultiWorldPlugin.onCommand(MultiWorldPlugin.java:206) ~[?:?]
	at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44) ~[1server.jar:git-Spigot-1387]
	... 13 more
[19:16:22] [Server thread/INFO]: luluvip03 issued server command: /f f
[19:16:23] [Async Chat Thread - #87/INFO]: [FactionChat] FACTION|mistercraftPVP: ki pvp
[19:16:26] [Server thread/WARN]: vincelenormand moved too quickly! -7.4847359488796315,-0.019460223791490705,49.51749462414682 (7.4847359488796315, 0.05904000107765199, 49.51749462414682)
[19:16:27] [Server thread/INFO]: guillaumeoll6 issued server command: /afk
[19:16:29] [Server thread/INFO]: citron56 issued server command: /back
[19:16:29] [Server thread/INFO]: Titou87270 lost connection: Internal Exception: java.io.IOException: Connexion ré-initialisée par le correspondant
[19:16:30] [Server thread/INFO]: Death14 issued server command: /spawn
[19:16:34] [Server thread/INFO]: YnsKaB94 issued server command: /warp
[19:16:35] [Server thread/INFO]: hang1778 issued server command: /mw goto event
[19:16:35] [Async Chat Thread - #87/INFO]: [Hub]  <Citoyen cadu93>: nn the thelordwolf stp alli
[19:16:35] [Server thread/INFO]: yoda1411 issued server command: /base
[19:16:37] [Server thread/INFO]: Ricot_92 issued server command: /mw goto event