Bukkit

This is running on a 1.6.4 mcpc+ server.  If you need additional information please let me know.

2013-12-24 07:07:28 [SEVERE] Exception in thread "Craft Scheduler Thread - 3424"
2013-12-24 07:07:28 [SEVERE] org.apache.commons.lang.UnhandledException: Plugin ItemRestrict v1.4 generated an exception while executing task 166502
    at org.bukkit.craftbukkit.v1_6_R3.scheduler.CraftAsyncTask.run(CraftAsyncTask.java:56)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
    at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.IllegalStateException: Asynchronous entity track!
    at net.minecraft.entity.EntityTracker.func_72785_a(EntityTracker.java:192)
    at net.minecraft.entity.EntityTracker.func_72786_a(EntityTracker.java:175)
    at net.minecraft.world.WorldManager.func_72703_a(WorldManager.java:37)
    at net.minecraft.world.World.func_72923_a(World.java:2023)
    at net.minecraft.world.WorldServer.func_72923_a(WorldServer.java:1293)
    at net.minecraft.world.World.func_72868_a(World.java:4432)
    at net.minecraft.world.chunk.Chunk.func_76631_c(Chunk.java:1161)
    at net.minecraft.world.gen.ChunkProviderServer.getChunkAt(ChunkProviderServer.java:226)
    at net.minecraft.world.gen.ChunkProviderServer.func_73158_c(ChunkProviderServer.java:159)
    at net.minecraft.world.gen.ChunkProviderServer.func_73154_d(ChunkProviderServer.java:265)
    at net.minecraft.world.World.func_72964_e(World.java:796)
    at org.bukkit.craftbukkit.v1_6_R3.CraftChunk.getHandle(CraftChunk.java:46)
    at org.bukkit.craftbukkit.v1_6_R3.block.CraftBlock.getTypeId(CraftBlock.java:139)
    at info.terrismc.itemrestrict.ConfigStore.getConfigStringParent(ConfigStore.java:214)
    at info.terrismc.itemrestrict.ConfigStore.isBanned(ConfigStore.java:65)
    at info.terrismc.itemrestrict.ConfigStore.isBannable(ConfigStore.java:129)
    at info.terrismc.itemrestrict.QuickStore$1.run(QuickStore.java:32)
    at org.bukkit.craftbukkit.v1_6_R3.scheduler.CraftTask.run(CraftTask.java:58)
    at org.bukkit.craftbukkit.v1_6_R3.scheduler.CraftAsyncTask.run(CraftAsyncTask.java:53)