NoLagg Chunk Generation Error

2013-07-07 19:18:26 [SEVERE] [NoLagg Chunks] An error occured while sending chunks:
2013-07-07 19:18:26 [SEVERE] net.minecraft.server.v1_5_R3.ReportedException: Exception generating new chunk
2013-07-07 19:18:26 [SEVERE]    at net.minecraft.server.v1_5_R3.ChunkProviderServer.getChunkAt(ChunkProviderServer.java:119)
2013-07-07 19:18:26 [SEVERE]    at com.bergerkiller.bukkit.common.bases.ChunkProviderServerBase.getBukkitChunkAt(ChunkProviderServerBase.java:105)
2013-07-07 19:18:26 [SEVERE]    at net.timedminecraft.server.TimedChunkProviderServer.getBukkitChunkAt(TimedChunkProviderServer.java:130)
2013-07-07 19:18:26 [SEVERE]    at com.bergerkiller.bukkit.common.bases.ChunkProviderServerBase.getChunkAt(ChunkProviderServerBase.java:92)
2013-07-07 19:18:26 [SEVERE]    at com.bergerkiller.bukkit.common.utils.ChunkUtil.getChunkAsync(ChunkUtil.java:277)
2013-07-07 19:18:26 [SEVERE]    at com.bergerkiller.bukkit.nolagg.chunks.ChunkSendQueue.sendBatch(ChunkSendQueue.java:369)
2013-07-07 19:18:26 [SEVERE]    at com.bergerkiller.bukkit.nolagg.chunks.ChunkSendQueue.update(ChunkSendQueue.java:319)
2013-07-07 19:18:26 [SEVERE]    at com.bergerkiller.bukkit.nolagg.chunks.ChunkSendQueue.update(ChunkSendQueue.java:297)
2013-07-07 19:18:26 [SEVERE]    at com.bergerkiller.bukkit.nolagg.chunks.ChunkSendQueue.access$100(ChunkSendQueue.java:33)
2013-07-07 19:18:26 [SEVERE]    at com.bergerkiller.bukkit.nolagg.chunks.ChunkSendQueue$ChunkSendingTask.run(ChunkSendQueue.java:58)
2013-07-07 19:18:26 [SEVERE]    at org.bukkit.craftbukkit.v1_5_R3.scheduler.CraftTask.run(CraftTask.java:53)
2013-07-07 19:18:26 [SEVERE]    at org.bukkit.craftbukkit.v1_5_R3.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:345)
2013-07-07 19:18:26 [SEVERE]    at net.minecraft.server.v1_5_R3.MinecraftServer.r(MinecraftServer.java:513)
2013-07-07 19:18:26 [SEVERE]    at net.minecraft.server.v1_5_R3.DedicatedServer.r(DedicatedServer.java:226)
2013-07-07 19:18:26 [SEVERE]    at net.minecraft.server.v1_5_R3.MinecraftServer.q(MinecraftServer.java:477)
2013-07-07 19:18:26 [SEVERE]    at net.minecraft.server.v1_5_R3.MinecraftServer.run(MinecraftServer.java:410)
2013-07-07 19:18:26 [SEVERE]    at net.minecraft.server.v1_5_R3.ThreadServerApplication.run(SourceFile:573)
2013-07-07 19:18:26 [SEVERE] Caused by: java.lang.ArrayIndexOutOfBoundsException: -1
2013-07-07 19:18:26 [SEVERE]    at uk.co.jacekk.bukkit.almostflatlands.generator.ChunkProvider.setBlockAt(ChunkProvider.java:43)
2013-07-07 19:18:26 [SEVERE]    at uk.co.jacekk.bukkit.almostflatlands.generator.ChunkProvider.generateBlockSections(ChunkProvider.java:69)
2013-07-07 19:18:26 [SEVERE]    at org.bukkit.craftbukkit.v1_5_R3.generator.CustomChunkGenerator.getOrCreateChunk(CustomChunkGenerator.java:98)
2013-07-07 19:18:26 [SEVERE]    at net.minecraft.server.v1_5_R3.ChunkProviderServer.getChunkAt(ChunkProviderServer.java:111)
2013-07-07 19:18:26 [SEVERE]    ... 16 more