Help with scoreboards

Hi, so I am making a kitpvp plugin (custom for my new network) and I was creating a scoreboard for kills and deaths and one day it stopped working..

Code:java

 
    @EventHandler
        public void onPlayerKill(PlayerDeathEvent e){
                Player p = e.getEntity().getKiller();
                org.bukkit.scoreboard.Scoreboard sb;
                Objective obj;
               ScoreboardManager sbManager = Bukkit.getScoreboardManager();
               sb = sbManager.getNewScoreboard();
               obj = sb.registerNewObjective("PizzaNetwork", "dummy");
               obj.setDisplaySlot(DisplaySlot.SIDEBAR);
               obj.setDisplayName("§6P§4i§6z§4z§6a §bNetwork");
               Score kills = obj.getScore(ChatColor.GREEN + "Kills:");
               kills.setScore(p.getStatistic(Statistic.PLAYER_KILLS));
               Score deaths = obj.getScore(ChatColor.GREEN + "Deaths:");
               deaths.setScore(p.getStatistic(Statistic.DEATHS));
               p.setScoreboard(sb);
                org.bukkit.scoreboard.Scoreboard sb1;
                Objective obj1;
               ScoreboardManager sb1Manager = Bukkit.getScoreboardManager();
               sb1 = sb1Manager.getNewScoreboard();
               obj1 = sb1.registerNewObjective("PizzaNetwork", "dummy");
               obj1.setDisplaySlot(DisplaySlot.SIDEBAR);
               obj1.setDisplayName("§6P§4i§6z§4z§6a §bNetwork");
               Score kills1 = obj1.getScore(ChatColor.GREEN + "Kills:");
               kills1.setScore(e.getEntity().getStatistic(Statistic.PLAYER_KILLS));
               Score deaths1 = obj1.getScore(ChatColor.GREEN + "Deaths:");
               deaths1.setScore(e.getEntity().getStatistic(Statistic.DEATHS));
               e.getEntity().setScoreboard(sb1);
        }

And yes I have other events that work in the code so

Console Error

Code:

[13:26:31 INFO]: BaconStripsMan died
[13:26:32 ERROR]: Could not pass event PlayerDeathEvent to KitPvP v1.0
org.bukkit.event.EventException
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.ja
va:294) ~[craftbukkit.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks]
        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.jav
a:62) ~[craftbukkit.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks]
        at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.j
ava:501) [craftbukkit.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks]
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.j
ava:486) [craftbukkit.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks]
        at org.bukkit.craftbukkit.v1_7_R3.event.CraftEventFactory.callPlayerDeat
hEvent(CraftEventFactory.java:370) [craftbukkit.jar:git-Bukkit-1.7.9-R0.1-10-g86
88bd4-b3092jnks]
        at net.minecraft.server.v1_7_R3.EntityPlayer.die(EntityPlayer.java:373)
[craftbukkit.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks]
        at org.bukkit.craftbukkit.v1_7_R3.entity.CraftLivingEntity.setHealth(Cra
ftLivingEntity.java:85) [craftbukkit.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092
jnks]
        at me.PizzaNetwork.KitPvP.Main.onWaterTouch(Main.java:56) [KitPvP.jar:?]

        at sun.reflect.GeneratedMethodAccessor92.invoke(Unknown Source) ~[?:?]
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1
.8.0_25]
        at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_25]
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.ja
va:292) [craftbukkit.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks]
        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.jav
a:62) [craftbukkit.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks]
        at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.j
ava:501) [craftbukkit.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks]
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.j
ava:486) [craftbukkit.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks]
        at net.minecraft.server.v1_7_R3.PlayerConnection.a(PlayerConnection.java
:235) [craftbukkit.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks]
        at net.minecraft.server.v1_7_R3.PacketPlayInFlying.a(SourceFile:137) [cr
aftbukkit.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks]
        at net.minecraft.server.v1_7_R3.PacketPlayInPosition.handle(SourceFile:6
3) [craftbukkit.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks]
        at net.minecraft.server.v1_7_R3.NetworkManager.a(NetworkManager.java:157
) [craftbukkit.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks]
        at net.minecraft.server.v1_7_R3.ServerConnection.c(SourceFile:134) [craf
tbukkit.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks]
        at net.minecraft.server.v1_7_R3.MinecraftServer.v(MinecraftServer.java:6
67) [craftbukkit.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks]
        at net.minecraft.server.v1_7_R3.DedicatedServer.v(DedicatedServer.java:2
60) [craftbukkit.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks]
        at net.minecraft.server.v1_7_R3.MinecraftServer.u(MinecraftServer.java:5
58) [craftbukkit.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks]
        at net.minecraft.server.v1_7_R3.MinecraftServer.run(MinecraftServer.java
:469) [craftbukkit.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks]
        at net.minecraft.server.v1_7_R3.ThreadServerApplication.run(SourceFile:6
28) [craftbukkit.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks]
Caused by: java.lang.NullPointerException
        at me.PizzaNetwork.KitPvP.Main.onPlayerKill(Main.java:157) ~[?:?]
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0
_25]
        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0
_25]
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1
.8.0_25]
        at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_25]
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.ja
va:292) ~[craftbukkit.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks]
        ... 24 more

Line 157:

Code:java

 
 kills.setScore(p.getStatistic(Statistic.PLAYER_KILLS));
 

EDIT by Timtower: merged posts

 

Make sure that kills is an integer & not null before adding it to the scoreboard.

 

Don't create a brand new scoreboard every time, get their current scoreboard and verify that it's in the proper format before setting a new one, you'll save a lot of resources.