object reference not set to an instance of an object unity

hi, im making an bullet with a explosion but i only want players from a different team to get pushbacked. howwever im getting this error messeage:
“object reference not set to an instance of an object unity”
on this line:

if(this.gameObject.GetComponent<SpellData>().Team != hitObject.GetComponent<Team>().TeamNum  && hitObject.rigidbody){

i cannot get the TeamNum variable from my hitObjects, anyone have a solution?
Thanks!

void OnTriggerEnter(Collider col){

		Debug.Log("explode!");
		DoExplode ();
	
}

void DoExplode()
{	

	Collider[] collider = Physics.OverlapSphere(transform.position, m_ExplosionRadius);
	exploFab = Instantiate(m_RadiusFab,transform.position,transform.rotation) as GameObject;
	
	foreach(Collider hitObject in collider)
	{
		
		
			if(this.gameObject.GetComponent<SpellData>().Team != hitObject.GetComponent<Team>().TeamNum  && hitObject.rigidbody){
			hitObject.gameObject.SendMessage("InflictDamage", m_ExplosionDamage,SendMessageOptions.DontRequireReceiver);
			hitObject.gameObject.rigidbody.AddForce((hitObject.transform.position - transform.position).normalized *m_ExploPushback);
			
		}
	}
	Destroy(gameObject);
}

}

Well, it could be that either your object doesn’t have a SpellData component, or the collider object doesn’t have a Team component!
Split that long line up and check neither is null before using.