Bukkit

What steps will reproduce the problem?
/rg region...

What version of the product are you using?
recent file with craftbukkit 1.6.4 R2.0 and Worldguard 5.8

Do you have an error log of what happened?
21:04:15 [INFO] SirWilli issued server command: /rt region 218 67 205 world
21:04:15 [SEVERE] null
21:04:15 org.bukkit.command.CommandException: Unhandled exception executing command 'rt' in plugin RegionTeleport v1.0
21:04:15 at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46)
21:04:15 at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:192)
21:04:15 at org.bukkit.craftbukkit.v1_6_R3.CraftServer.dispatchCommand(CraftServer.java:528)
21:04:15 at net.minecraft.server.v1_6_R3.PlayerConnection.handleCommand(PlayerConnection.java:968)
21:04:15 at net.minecraft.server.v1_6_R3.PlayerConnection.chat(PlayerConnection.java:886)
21:04:15 at net.minecraft.server.v1_6_R3.PlayerConnection.a(PlayerConnection.java:837)
21:04:15 at net.minecraft.server.v1_6_R3.Packet3Chat.handle(SourceFile:49)
21:04:15 at net.minecraft.server.v1_6_R3.NetworkManager.b(NetworkManager.java:296)
21:04:15 at net.minecraft.server.v1_6_R3.PlayerConnection.e(PlayerConnection.java:116)
21:04:15 at net.minecraft.server.v1_6_R3.ServerConnection.b(SourceFile:37)
21:04:15 at net.minecraft.server.v1_6_R3.DedicatedServerConnection.b(SourceFile:30)
21:04:15 at net.minecraft.server.v1_6_R3.MinecraftServer.t(MinecraftServer.java:592)
21:04:15 at net.minecraft.server.v1_6_R3.DedicatedServer.t(DedicatedServer.java:227)
21:04:15 at net.minecraft.server.v1_6_R3.MinecraftServer.s(MinecraftServer.java:488)
21:04:15 at net.minecraft.server.v1_6_R3.MinecraftServer.run(MinecraftServer.java:421)
21:04:15 at net.minecraft.server.v1_6_R3.ThreadServerApplication.run(SourceFile:583)
21:04:15 Caused by: java.lang.NullPointerException
21:04:15 at com.woutwoot.RegionTeleport.RegionTeleport.onCommand(RegionTeleport.java:50)
21:04:15 at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44)
21:04:15 ... 15 more

Please provide any additional information below.