Bukkit Plugin "Chairs Reloaded" has no Multiverse support???

23:35:14 [INFO] [ClearLag] Warning Ground items will be removed in one minute!
23:36:14 [INFO] [ClearLag] Removed 15 Entities!
23:39:25 [SEVERE] Could not pass event PlayerInteractEvent to Chairs v2.1.5
org.bukkit.event.EventException
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:427)
        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62)
        at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:477)
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:462)
        at org.bukkit.craftbukkit.v1_6_R1.event.CraftEventFactory.callPlayerInteractEvent(CraftEventFactory.java:
        at net.minecraft.server.v1_6_R1.PlayerInteractManager.interact(PlayerInteractManager.java:373)
        at net.minecraft.server.v1_6_R1.PlayerConnection.a(PlayerConnection.java:649)
        at net.minecraft.server.v1_6_R1.Packet15Place.handle(SourceFile:58)
        at net.minecraft.server.v1_6_R1.NetworkManager.b(NetworkManager.java:293)
        at net.minecraft.server.v1_6_R1.PlayerConnection.d(PlayerConnection.java:118)
        at net.minecraft.server.v1_6_R1.ServerConnection.b(SourceFile:37)
        at net.minecraft.server.v1_6_R1.DedicatedServerConnection.b(SourceFile:30)
        at net.minecraft.server.v1_6_R1.MinecraftServer.t(MinecraftServer.java:590)
        at net.minecraft.server.v1_6_R1.DedicatedServer.t(DedicatedServer.java:226)
        at net.minecraft.server.v1_6_R1.MinecraftServer.s(MinecraftServer.java:486)
        at net.minecraft.server.v1_6_R1.MinecraftServer.run(MinecraftServer.java:419)
        at net.minecraft.server.v1_6_R1.ThreadServerApplication.run(SourceFile:582)
Caused by: java.lang.IllegalArgumentException: Cannot measure distance between world and world_plots
        at org.bukkit.Location.distanceSquared(Location.java:381)
        at org.bukkit.Location.distance(Location.java:364)
        at com.cnaude.chairs.EventListener.onPlayerInteract(EventListener.java:208)
        at sun.reflect.GeneratedMethodAccessor72.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
        at java.lang.reflect.Method.invoke(Unknown Source)
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:425)
        ... 16 more
23:41:54 [INFO] [ClearLag] Warning Ground items will be removed in one minute!
23:42:54 [INFO] [ClearLag] Removed 12 Entities!