[Part 4] NullReferenceException: OnTriggerEnter2D

[isaac795]

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When my weapon hit the enemy it showed this error. I tried using Debug.Log(“Enemy health:” + enemyData.Maxhealth) at EnemyController script and yes it shows the enemy health next I’m using Debug.Log(“Enemy take damage: ” + currentDamage) and at ProjectileWeaponBehavior script and it shows enemy take the damage. But I tried to Debug.Log(“Enemy: ” + enemy) but it showed nothing. What do I miss 🤔🤣

[isaac795]

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<code>protected virtual void OnTriggerEnter2D(Collider2D col)     //col = collider
    {

        if (col.CompareTag("Enemy"))
        {
            EnemyStats enemy = col.GetComponent<EnemyStats>();
            Debug.Log("Enemy: " + enemy);
            enemy.TakeDamage(currentDamage);   <== Error Here 
            Debug.Log("Enemy take damage: " + currentDamage);
        }
    }</code>

[isaac795]

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I already set a tag as “Enemy”

[isaac795]

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Here’s TakeDamage function

<code>
void Awake()
    {
       currentHealth = enemyData.Maxhealth;
    }
public void TakeDamage(float dmg)
    {

        currentHealth -= dmg;
        if (currentHealth <= 0)
        {
            Dead();          <== Destroy game object
        }
    }</code>

[Terence]

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isaac, the error is caused by this line:

EnemyStats enemy = col.GetComponent<EnemyStats>();

If the line fails to find an EnemyStats component, then the enemy variable will be empty. This is why enemy.TakeDamage() has an error, because it evaluates to null.TakeDamage().

Check that the enemy prefabs in your game all have an EnemyStats component.

[isaac795]

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You correct bro. ty

[Author]

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