onPlayerDeath 03

if (event.getSource() instanceof ModDamageSource) {
    serverPlayerEntity.removePotionEffect(LifeBindingPotion.LIFE_DAMAGING_EFFECT.get());
    BoundPlayersList.removeUsername(bound.getUUID());

} else if (player.getServer().getPlayerList().getPlayerByUUID(bound.getUUID()) == null) {
    BoundPlayersList.setUsername(bound.getUUID(), bound.getName());
}