How to fix this error NullReferenceException: Object reference not set to an instance of an object Damage.OnTriggerEnter2D?

Question

C++ / C#

I made a collider for melee range. When another object enters this collider, Unity throws an error
Script:

void AttackPoint()
    {
        Collider2D[] hit = Physics2D.OverlapCircleAll(attackPoint.position, attackRange, enemyLayers);
    }

    private void OnDrawGizmosSelected()
    {
        if (attackPoint == null)
            return;

        Gizmos.DrawWireSphere(attackPoint.position, attackRange);
    }

Answer 1

Make checks everywherenull