My code sends the message twice

Hello! Does anyone know why my code sends the message to the chat twice when I click on an animal instead of doing it only once? Thank you!

Code:

package me.tomas.prueba;


import org.bukkit.Bukkit;
import org.bukkit.entity.Entity;
import org.bukkit.entity.Player;
import org.bukkit.event.EventHandler;
import org.bukkit.event.Listener;
import org.bukkit.event.player.PlayerInteractEntityEvent;
import org.bukkit.plugin.java.JavaPlugin;

public class Prueba extends JavaPlugin implements Listener {

    @Override
    public void onEnable() {

        Bukkit.getPluginManager().registerEvents(this, this);
    }

    @EventHandler
    public void onPlayerInteractEntity(PlayerInteractEntityEvent event) {
        Player player = event.getPlayer();
        Entity entity = event.getRightClicked();
        player.sendMessage(player.getDisplayName() + " a clickeado a un/a " + entity.getName());
    }
}

 

How can I do that?

 

Code:

event.getHand() == EquipmentSlot.HAND