ptweaks w/ Spigot #635

2013-04-01 19:54:38 [SEVERE] Error occurred while disabling pTweaks v6.0.3 (Is it up to date?)
java.lang.IllegalStateException: Asynchronous chunk unload!
	at org.bukkit.craftbukkit.v1_5_R2.CraftWorld.unloadChunk(CraftWorld.java:295)
	at org.bukkit.craftbukkit.v1_5_R2.CraftWorld.unloadChunk(CraftWorld.java:276)
	at org.bukkit.craftbukkit.v1_5_R2.CraftWorld.unloadChunk(CraftWorld.java:272)
	at me.devplugin.ptweaks.ChunkPersistance.onDisable(ChunkPersistance.java:64)
	at me.devplugin.ptweaks.PerformanceTweaks.onDisable(PerformanceTweaks.java:55)
	at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:219)
	at org.bukkit.plugin.java.JavaPluginLoader.disablePlugin(JavaPluginLoader.java:481)
	at org.bukkit.plugin.SimplePluginManager.disablePlugin(SimplePluginManager.java:402)
	at org.bukkit.plugin.SimplePluginManager.disablePlugins(SimplePluginManager.java:395)
	at org.bukkit.craftbukkit.v1_5_R2.CraftServer.disablePlugins(CraftServer.java:300)
	at net.minecraft.server.v1_5_R2.MinecraftServer.stop(MinecraftServer.java:337)
	at org.bukkit.craftbukkit.v1_5_R2.Spigot.restart(Spigot.java:320)
	at org.spigotmc.WatchdogThread.run(WatchdogThread.java:81)