I get this error when I walk too far in a new map. Version 2.4.9 on CraftBukkit 1.5.1

2013-03-28 07:22:29 [WARNING] Failed to handle packet for SantaKlaws/192.168.1.1: net.minecraft.server.v1_5_R2.ReportedException: Exception generating new chunk
net.minecraft.server.v1_5_R2.ReportedException: Exception generating new chunk
at net.minecraft.server.v1_5_R2.ChunkProviderServer.getChunkAt(ChunkProviderServer.java:119)
at net.minecraft.server.v1_5_R2.PlayerChunk.(PlayerChunk.java:24)
at net.minecraft.server.v1_5_R2.PlayerChunkMap.a(PlayerChunkMap.java:69)
at net.minecraft.server.v1_5_R2.PlayerChunkMap.b(PlayerChunkMap.java:144)
at net.minecraft.server.v1_5_R2.PlayerChunkMap.movePlayer(PlayerChunkMap.java:220)
at net.minecraft.server.v1_5_R2.PlayerList.d(PlayerList.java:246)
at net.minecraft.server.v1_5_R2.PlayerConnection.a(PlayerConnection.java:423)
at net.minecraft.server.v1_5_R2.Packet10Flying.handle(SourceFile:136)
at net.minecraft.server.v1_5_R2.NetworkManager.b(NetworkManager.java:292)
at net.minecraft.server.v1_5_R2.PlayerConnection.d(PlayerConnection.java:110)
at net.minecraft.server.v1_5_R2.ServerConnection.b(SourceFile:35)
at net.minecraft.server.v1_5_R2.DedicatedServerConnection.b(SourceFile:30)
at net.minecraft.server.v1_5_R2.MinecraftServer.r(MinecraftServer.java:578)
at net.minecraft.server.v1_5_R2.DedicatedServer.r(DedicatedServer.java:225)
at net.minecraft.server.v1_5_R2.MinecraftServer.q(MinecraftServer.java:474)
at net.minecraft.server.v1_5_R2.MinecraftServer.run(MinecraftServer.java:407)
at net.minecraft.server.v1_5_R2.ThreadServerApplication.run(SourceFile:573)
Caused by: java.lang.NullPointerException
at com.khorn.terraincontrol.generator.ChunkProviderTC.generateTerrain(ChunkProviderTC.java:104)
at com.khorn.terraincontrol.generator.ChunkProviderTC.generate(ChunkProviderTC.java:450)
at com.khorn.terraincontrol.bukkit.TCChunkGenerator.generateBlockSections(TCChunkGenerator.java:70)
at org.bukkit.craftbukkit.v1_5_R2.generator.CustomChunkGenerator.getOrCreateChunk(CustomChunkGenerator.java:98)
at net.minecraft.server.v1_5_R2.ChunkProviderServer.getChunkAt(ChunkProviderServer.java:111)
... 16 more

Duplicate of #144. I haven't found a solution yet. 😦