Problem/Bug Bukkit 1.7.9 crashes on join

When a player joins my friends that i'm helping with it sometimes crashes, can someone help me fix this?

Errors (open) Errors (close)

12.02 20:28:31 [Server] ERROR This crash report has been saved to: /./crash-reports/crash-2015-02-12_20.28.31-server.txt 12.02 20:28:31 [Server] INFO ... 13 more 12.02 20:28:31 [Server] INFO at net.minecraft.server.v1_7_R3.Chunk.getType(Chunk.java:404) ~[craftbukkit-dev.jar:git-Bukkit-1.7.9-R0.2-11-g3fd9db2-b3098jnks] 12.02 20:28:31 [Server] INFO at net.minecraft.server.v1_7_R3.ChunkSection.getTypeId(ChunkSection.java:92) ~[craftbukkit-dev.jar:git-Bukkit-1.7.9-R0.2-11-g3fd9db2-b3098jnks] 12.02 20:28:31 [Server] INFO Caused by: java.lang.ArrayIndexOutOfBoundsException: -4336 12.02 20:28:31 [Server] INFO at net.minecraft.server.v1_7_R3.ThreadServerApplication.run(SourceFile:628) [craftbukkit-dev.jar:git-Bukkit-1.7.9-R0.2-11-g3fd9db2-b3098jnks] 12.02 20:28:31 [Server] INFO at net.minecraft.server.v1_7_R3.MinecraftServer.run(MinecraftServer.java:469) [craftbukkit-dev.jar:git-Bukkit-1.7.9-R0.2-11-g3fd9db2-b3098jnks] 12.02 20:28:31 [Server] INFO at net.minecraft.server.v1_7_R3.MinecraftServer.u(MinecraftServer.java:558) ~[craftbukkit-dev.jar:git-Bukkit-1.7.9-R0.2-11-g3fd9db2-b3098jnks] 12.02 20:28:31 [Server] INFO at net.minecraft.server.v1_7_R3.DedicatedServer.v(DedicatedServer.java:260) ~[craftbukkit-dev.jar:git-Bukkit-1.7.9-R0.2-11-g3fd9db2-b3098jnks] 12.02 20:28:31 [Server] INFO at net.minecraft.server.v1_7_R3.MinecraftServer.v(MinecraftServer.java:607) ~[craftbukkit-dev.jar:git-Bukkit-1.7.9-R0.2-11-g3fd9db2-b3098jnks] 12.02 20:28:31 [Server] INFO at org.bukkit.craftbukkit.v1_7_R3.chunkio.ChunkIOExecutor.tick(ChunkIOExecutor.java:34) ~[craftbukkit-dev.jar:git-Bukkit-1.7.9-R0.2-11-g3fd9db2-b3098jnks] 12.02 20:28:31 [Server] INFO at org.bukkit.craftbukkit.v1_7_R3.util.AsynchronousExecutor.finishActive(AsynchronousExecutor.java:347) ~[craftbukkit-dev.jar:git-Bukkit-1.7.9-R0.2-11-g3fd9db2-b3098jnks] 12.02 20:28:31 [Server] INFO at org.bukkit.craftbukkit.v1_7_R3.util.AsynchronousExecutor$Task.finish(AsynchronousExecutor.java:188) ~[craftbukkit-dev.jar:git-Bukkit-1.7.9-R0.2-11-g3fd9db2-b3098jnks] 12.02 20:28:31 [Server] INFO at org.bukkit.craftbukkit.v1_7_R3.chunkio.ChunkIOProvider.callStage2(ChunkIOProvider.java:13) ~[craftbukkit-dev.jar:git-Bukkit-1.7.9-R0.2-11-g3fd9db2-b3098jnks] 12.02 20:28:31 [Server] INFO at org.bukkit.craftbukkit.v1_7_R3.chunkio.ChunkIOProvider.callStage2(ChunkIOProvider.java:37) ~[craftbukkit-dev.jar:git-Bukkit-1.7.9-R0.2-11-g3fd9db2-b3098jnks] 12.02 20:28:31 [Server] INFO at net.minecraft.server.v1_7_R3.ChunkRegionLoader.loadEntities(ChunkRegionLoader.java:387) ~[craftbukkit-dev.jar:git-Bukkit-1.7.9-R0.2-11-g3fd9db2-b3098jnks] 12.02 20:28:31 [Server] INFO at net.minecraft.server.v1_7_R3.Chunk.a(Chunk.java:688) ~[craftbukkit-dev.jar:git-Bukkit-1.7.9-R0.2-11-g3fd9db2-b3098jnks] 12.02 20:28:31 [Server] INFO at net.minecraft.server.v1_7_R3.Chunk.a(Chunk.java:701) ~[craftbukkit-dev.jar:git-Bukkit-1.7.9-R0.2-11-g3fd9db2-b3098jnks] 12.02 20:28:31 [Server] INFO at net.minecraft.server.v1_7_R3.Chunk.getType(Chunk.java:410) ~[craftbukkit-dev.jar:git-Bukkit-1.7.9-R0.2-11-g3fd9db2-b3098jnks] 12.02 20:28:31 [Server] INFO net.minecraft.server.v1_7_R3.ReportedException: Getting block 12.02 20:28:31 [Server] ERROR Encountered an unexpected exception

 

Hmmm... It might be a chunk problem, load server with different worlds and see if it solves it or reset client's login location

 

try what they said first, if that doesn't work, set the spawn point to a different block, that may be causing the crash.