How to check if this returns null or not?

[/u/Dark_Gladiator]

package me.gladiator.betraysmp.events;
import net.md_5.bungee.api.ChatColor;
import org.bukkit.Bukkit;
import org.bukkit.Material;
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 org.bukkit.inventory.Inventory;
import org.bukkit.inventory.ItemStack;
import org.bukkit.inventory.meta.ItemMeta;
import java.util.Arrays;
public class OnIngotClickOpenGUI implements Listener {

u/EventHandler
public ItemStack BetrayGUI(PlayerInteractEvent event)
{

System.out.println("At least started");
ItemStack BetrayIngot = new ItemStack(Material.NETHERITE_INGOT);
ItemMeta meta = BetrayIngot.getItemMeta();
meta.setDisplayName(ChatColor.LIGHT_PURPLE + "" + ChatColor.BOLD + "Betray Ingot");
meta.setLore(Arrays.asList("The Betray Ingot.", "Use 4 of these to craft a Ban Token."));
BetrayIngot.setItemMeta(meta);
if(event.getAction() == (Action.RIGHT_CLICK_AIR) || event.getAction() == (Action.RIGHT_CLICK_BLOCK))
{
if(event.getPlayer().getInventory().getItemInMainHand().getType().equals(BetrayIngot))
{
System.out.println("passed the ingot check");
Player player = event.getPlayer();
Inventory gui = Bukkit.getServer().createInventory(player, 27, ChatColor.GOLD + "" + ChatColor.BOLD + "Betray Ingot Craft");
ItemStack shell = new ItemStack(Material.NAUTILUS_SHELL);
ItemStack sea = new ItemStack(Material.HEART_OF_THE_SEA);
gui.setItem(11, shell);
gui.setItem(15, sea);
player.openInventory(gui);
}
}
return null;
}

}

submitted by /u/Dark_Gladiator
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