Problem with PlayerInteractEvent

Whenever I click with an item pointing to the air, i get this error from the cmd:

Code:

[18:00:43 ERROR]: Could not pass event PlayerInteractEvent to HotbarKits v1.0
org.bukkit.event.EventException: null
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:306) ~[spigot-1.12.2.jar:git-Spigot-3d850ec-809c399]
        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[spigot-1.12.2.jar:git-Spigot-3d850ec-809c399]
        at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:500) [spigot-1.12.2.jar:git-Spigot-3d850ec-809c399]
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:485) [spigot-1.12.2.jar:git-Spigot-3d850ec-809c399]
        at org.bukkit.craftbukkit.v1_12_R1.event.CraftEventFactory.callPlayerInteractEvent(CraftEventFactory.java:235) [spigot-1.12.2.jar:git-Spigot-3d850ec-809c399]
        at org.bukkit.craftbukkit.v1_12_R1.event.CraftEventFactory.callPlayerInteractEvent(CraftEventFactory.java:202) [spigot-1.12.2.jar:git-Spigot-3d850ec-809c399]
        at org.bukkit.craftbukkit.v1_12_R1.event.CraftEventFactory.callPlayerInteractEvent(CraftEventFactory.java:198) [spigot-1.12.2.jar:git-Spigot-3d850ec-809c399]
        at net.minecraft.server.v1_12_R1.PlayerConnection.a(PlayerConnection.java:989) [spigot-1.12.2.jar:git-Spigot-3d850ec-809c399]
        at net.minecraft.server.v1_12_R1.PacketPlayInBlockPlace.a(PacketPlayInBlockPlace.java:26) [spigot-1.12.2.jar:git-Spigot-3d850ec-809c399]
        at net.minecraft.server.v1_12_R1.PacketPlayInBlockPlace.a(PacketPlayInBlockPlace.java:1) [spigot-1.12.2.jar:git-Spigot-3d850ec-809c399]
        at net.minecraft.server.v1_12_R1.PlayerConnectionUtils$1.run(SourceFile:13) [spigot-1.12.2.jar:git-Spigot-3d850ec-809c399]
        at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) [?:?]
        at java.util.concurrent.FutureTask.run(Unknown Source) [?:?]
        at net.minecraft.server.v1_12_R1.SystemUtils.a(SourceFile:46) [spigot-1.12.2.jar:git-Spigot-3d850ec-809c399]
        at net.minecraft.server.v1_12_R1.MinecraftServer.D(MinecraftServer.java:748) [spigot-1.12.2.jar:git-Spigot-3d850ec-809c399]
        at net.minecraft.server.v1_12_R1.DedicatedServer.D(DedicatedServer.java:406) [spigot-1.12.2.jar:git-Spigot-3d850ec-809c399]
        at net.minecraft.server.v1_12_R1.MinecraftServer.C(MinecraftServer.java:679) [spigot-1.12.2.jar:git-Spigot-3d850ec-809c399]
        at net.minecraft.server.v1_12_R1.MinecraftServer.run(MinecraftServer.java:577) [spigot-1.12.2.jar:git-Spigot-3d850ec-809c399]
        at java.lang.Thread.run(Unknown Source) [?:?]
Caused by: java.lang.NullPointerException
        at me.Fep310.HotbarKits.Events.KitClick.onChooseStdKit(KitClick.java:25) ~[?:?]
        at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:?]
        at jdk.internal.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:?]
        at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:?]
        at java.lang.reflect.Method.invoke(Unknown Source) ~[?:?]
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:302) ~[spigot-1.12.2.jar:git-Spigot-3d850ec-809c399]
        ... 18 more

This is the code that triggers this error:

Code:

package me.Fep310.HotbarKits.Events;

import org.bukkit.entity.Player;
import org.bukkit.event.EventHandler;
import org.bukkit.event.Listener;
import org.bukkit.event.block.Action;
import org.bukkit.event.player.PlayerInteractEvent;

import me.Fep310.HotbarKits.Main;
import net.md_5.bungee.api.ChatColor;

public class KitClick implements Listener {
 
    public KitClick(Main plugin) {
        plugin.getServer().getPluginManager().registerEvents(this, plugin);
    }
 
    @EventHandler
    public void onChooseStdKit(PlayerInteractEvent e) {
     
        Player p = e.getPlayer();
        Action a = e.getAction();
     
        if ((a.equals(Action.RIGHT_CLICK_AIR))) {
            if (e.getItem().getItemMeta().getDisplayName().contains("Standard")) {
                p.sendMessage(ChatColor.GOLD + "" + ChatColor.BOLD + "< ! > " + ChatColor.GRAY + "You chose the standard kit!");
            }
            else if (e.getItem().getItemMeta().getDisplayName().contains("GO PVP!")) {
                p.sendMessage(ChatColor.GOLD + "" + ChatColor.BOLD + "< ! > " + ChatColor.RED + "You are now in the arena! " + ChatColor.BOLD + "Good Luck.");
            }
        }
    }
}

What should I do??

 

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