Crash server help :(

When I enter to the server the server exit me putting"internet exception" this is the code that put me the server 

[ERROR] [FML]: Exception caught during firing event net.minecraftforge.fml.common.network.FMLNetworkEvent$ServerConnectionFromClientEvent@ce8192f5:

java.lang.NullPointerException

at com.khorn.terraincontrol.forge.events.PlayerTracker.SendWorldAndBiomeConfigs(PlayerTracker.java:102) ~[PlayerTracker.class:?]

at com.khorn.terraincontrol.forge.events.PlayerTracker.onConnectionCreated(PlayerTracker.java:67) ~[PlayerTracker.class:?]

at net.minecraftforge.fml.common.eventhandler.ASMEventHandler_250_PlayerTracker_onConnectionCreated_ServerConnectionFromClientEvent.invoke(.dynamic) ~[?:?]

at net.minecraftforge.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:90) ~[ASMEventHandler.class:?]

at net.minecraftforge.fml.common.eventhandler.EventBus.post(EventBus.java:185) [EventBus.class:?]

at net.minecraftforge.fml.common.network.handshake.NetworkDispatcher.completeServerSideConnection(NetworkDispatcher.java:257) [NetworkDispatcher.class:?]

at net.minecraftforge.fml.common.network.handshake.NetworkDispatcher.access$100(NetworkDispatcher.java:73) [NetworkDispatcher.class:?]

at net.minecraftforge.fml.common.network.handshake.NetworkDispatcher$1.func_73660_a(NetworkDispatcher.java:209) [NetworkDispatcher$1.class:?]

at net.minecraft.network.NetworkManager.func_74428_b(NetworkManager.java:287) [eo.class:?]

at net.minecraft.network.NetworkSystem.func_151269_c(NetworkSystem.java:180) [md.class:?]

at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:732) [MinecraftServer.class:?]

at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:387) [ld.class:?]

at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:613) [MinecraftServer.class:?]

at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:471) [MinecraftServer.class:?]

at java.lang.Thread.run(Thread.java:813) [?:1.8.0_192]

[ERROR] [FML]: Index: 1 Listeners:

[ERROR] [FML]: 0: NORMAL

[ERROR] [FML]: 1: ASM: com.khorn.terraincontrol.forge.events.PlayerTracker@cfcd6b90 onConnectionCreated(Lnet/minecraftforge/fml/common/network/FMLNetworkEvent$ServerConnectionFromClientEvent;)V

[ERROR] [FML]: 2: ASM: appeng.core.sync.network.NetworkHandler@86e5901f newConnection(Lnet/minecraftforge/fml/common/network/FMLNetworkEvent$ServerConnectionFromClientEvent;)V

[WARNING] Failed to handle packet for /xxxxxxxxx

java.lang.NullPointerException

at com.khorn.terraincontrol.forge.events.PlayerTracker.SendWorldAndBiomeConfigs(PlayerTracker.java:102) ~[PlayerTracker.class:?]

at com.khorn.terraincontrol.forge.events.PlayerTracker.onConnectionCreated(PlayerTracker.java:67) ~[PlayerTracker.class:?]

at net.minecraftforge.fml.common.eventhandler.ASMEventHandler_250_PlayerTracker_onConnectionCreated_ServerConnectionFromClientEvent.invoke(.dynamic) ~[?:?]

at net.minecraftforge.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:90) ~[ASMEventHandler.class:?]

at net.minecraftforge.fml.common.eventhandler.EventBus.post(EventBus.java:185) ~[EventBus.class:?]

at net.minecraftforge.fml.common.network.handshake.NetworkDispatcher.completeServerSideConnection(NetworkDispatcher.java:257) ~[NetworkDispatcher.class:?]

at net.minecraftforge.fml.common.network.handshake.NetworkDispatcher.access$100(NetworkDispatcher.java:73) ~[NetworkDispatcher.class:?]

at net.minecraftforge.fml.common.network.handshake.NetworkDispatcher$1.func_73660_a(NetworkDispatcher.java:209) ~[NetworkDispatcher$1.class:?]

at net.minecraft.network.NetworkManager.func_74428_b(NetworkManager.java:287) ~[eo.class:?]

at net.minecraft.network.NetworkSystem.func_151269_c(NetworkSystem.java:180) [md.class:?]

at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:732) [MinecraftServer.class:?]

at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:387) [ld.class:?]

at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:613) [MinecraftServer.class:?]

at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:471) [MinecraftServer.class:?]

at java.lang.Thread.run(Thread.java:813) [?:1.8.0_192]

[INFO] undoinJ lost connection: TextComponent{text='Internal server error', siblings=[], style=Style{hasParent=false, color=null, bold=null, italic=null, underlined=null, obfuscated=null, clickEvent=null, hoverEvent=null, insertion=null}}

[INFO] undoinJ left the game

need help