Solved NullPointerException in PlayerDeathEvent

Trying to implement the plugins that will make players drop only expensive items.
Here is shortcut of the code:

Code:

    public HashMap<Player , ItemStack[]> items = new HashMap<Player , ItemStack[]>();

    @EventHandler
    public void onDeath(PlayerDeathEvent event)
    {
        if (event.getEntity().getGameMode().equals(GameMode.SURVIVAL))
        {
            ItemStack[] content = event.getEntity().getInventory().getContents();
            items.put(event.getEntity(), content);
            event.getDrops().removeIf(stack -> !this.isExpensive(stack.getType().toString()));
            // isExpensive method returns 1 if the itemstack is expensive, 0 either
        }
    }

    @EventHandler
    public void onRespawn(PlayerRespawnEvent event)
    {
        if (event.getPlayer().getGameMode().equals(GameMode.SURVIVAL) && items.containsKey(event.getPlayer()))
        {
            for (ItemStack stack : items.get(event.getPlayer()))
            {
                if (!this.isExpensive(stack.getType().toString()))
                    event.getPlayer().getInventory().addItem(stack);
            }
            items.remove(event.getPlayer());
        }
    }

Everything is working fine (except netherite items, idk why but their itemstack type is "AIR", that's another question), but I have some exceptions in console everytime player dies

Code:

[01:35:18 ERROR]: Could not pass event PlayerRespawnEvent to ChokeDrop v1
java.lang.NullPointerException: null
    at ru.h4sv.chokedrop.Handler.onRespawn(Handler.java:64) ~[?:?]
    at com.destroystokyo.paper.event.executor.asm.generated.GeneratedEventExecutor3.execute(Unknown Source) ~[?:?]
    at org.bukkit.plugin.EventExecutor.lambda$create$1(EventExecutor.java:69) ~[patched_1.16.4.jar:git-Paper-337]
    at co.aikar.timings.TimedEventExecutor.execute(TimedEventExecutor.java:80) ~[patched_1.16.4.jar:git-Paper-337]
    at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:70) ~[patched_1.16.4.jar:git-Paper-337]
    at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:607) ~[patched_1.16.4.jar:git-Paper-337]
    at net.minecraft.server.v1_16_R3.PlayerList.moveToWorld(PlayerList.java:821) ~[patched_1.16.4.jar:git-Paper-337]
    at net.minecraft.server.v1_16_R3.PlayerList.moveToWorld(PlayerList.java:719) ~[patched_1.16.4.jar:git-Paper-337]
    at net.minecraft.server.v1_16_R3.PlayerConnection.a(PlayerConnection.java:2286) ~[patched_1.16.4.jar:git-Paper-337]
    at net.minecraft.server.v1_16_R3.PacketPlayInClientCommand.a(SourceFile:30) ~[patched_1.16.4.jar:git-Paper-337]
    at net.minecraft.server.v1_16_R3.PacketPlayInClientCommand.a(SourceFile:8) ~[patched_1.16.4.jar:git-Paper-337]
    at net.minecraft.server.v1_16_R3.PlayerConnectionUtils.lambda$ensureMainThread$1(PlayerConnectionUtils.java:23) ~[patched_1.16.4.jar:git-Paper-337]
    at net.minecraft.server.v1_16_R3.TickTask.run(SourceFile:18) ~[patched_1.16.4.jar:git-Paper-337]
    at net.minecraft.server.v1_16_R3.IAsyncTaskHandler.executeTask(IAsyncTaskHandler.java:136) ~[patched_1.16.4.jar:git-Paper-337]
    at net.minecraft.server.v1_16_R3.IAsyncTaskHandlerReentrant.executeTask(SourceFile:23) ~[patched_1.16.4.jar:git-Paper-337]
    at net.minecraft.server.v1_16_R3.IAsyncTaskHandler.executeNext(IAsyncTaskHandler.java:109) ~[patched_1.16.4.jar:git-Paper-337]
    at net.minecraft.server.v1_16_R3.MinecraftServer.bb(MinecraftServer.java:1133) ~[patched_1.16.4.jar:git-Paper-337]
    at net.minecraft.server.v1_16_R3.MinecraftServer.executeNext(MinecraftServer.java:1126) ~[patched_1.16.4.jar:git-Paper-337]
    at net.minecraft.server.v1_16_R3.IAsyncTaskHandler.awaitTasks(IAsyncTaskHandler.java:119) ~[patched_1.16.4.jar:git-Paper-337]
    at net.minecraft.server.v1_16_R3.MinecraftServer.sleepForTick(MinecraftServer.java:1087) ~[patched_1.16.4.jar:git-Paper-337]
    at net.minecraft.server.v1_16_R3.MinecraftServer.w(MinecraftServer.java:1001) ~[patched_1.16.4.jar:git-Paper-337]
    at net.minecraft.server.v1_16_R3.MinecraftServer.lambda$a$0(MinecraftServer.java:178) ~[patched_1.16.4.jar:git-Paper-337]
    at java.lang.Thread.run(Thread.java:748) [?:1.8.0_271]

As I understand, exception is caught by following string:

Code:

if (!this.isExpensive(stack.getType().toString()))
     event.getPlayer().getInventory().addItem(stack);

I really don't know where is problem here. Thanks in advantage.

 

@timtower how can it be null?

ok i'm idiot, all i had to do was to add if (stack != null), solved

Code:

public final HashMap<String, ItemStack[]> inv = new HashMap<>();

@EventHandlerpublic void onDeath(PlayerDeathEvent e)
{
inv.put(e.getEntity().getName(), e.getEntity().getInventory().getContents());e.getDrops().removeIf(stack -> !this.isExpensive(stack.getType().toString()));}

@EventHandlerpublic void onRespawn(PlayerRespawnEvent event)
{
ItemStack [] content = inv.get(event.getPlayer().getName()); for (ItemStack stack : content)
if (stack != null)
if (this.isExpensive(stack.getType().toString()))
stack.setType(Material.AIR);event.getPlayer().getInventory().setContents(content);}

EDIT by Moderator: merged posts, please use the edit button instead of double posting.