Unity crashes on certain collisions

So I'm working on an upwards scrolling space shoot em up.

The Player has a character controller and rigidbody and this code regarding the collisions (please ignore CamelCase errors and indenting)

function OnCollisionEnter(hit : Collision)

{ var targeto = hit.gameObject;

    if (targeto.tag == ("Enemy"))
    {
                    targeto.GetComponent(typeof (enemyBehaviour)).TakeDamage(100);
                    Boom();
    } 

}

Whenever the player collides with an enemy he damages the enemy ship and explodes. Now the strange thing is, sometimes the entire editor crashes when I do test this. The strange part is that it only happens sometimes, it seems to be only a second type of enemy, although they have all the exact same components and the same script, OR if I first shot an enemy before crashing into another.

if (Input.GetButtonDown("Fire1"))
    {
    var shotpos1= new Vector3(transform.position.x+0.5,transform.position.y,transform.position.z+2);
    var shotpos2= new Vector3(transform.position.x-0.5,transform.position.y,transform.position.z+2);
    var shot1 = Instantiate(shot, shotpos1, transform.rotation);
    var shot2 = Instantiate(shot, shotpos2, transform.rotation);
    }
}

(and in the bullets script)

function OnCollisionEnter(collision : Collision)
    {
        var targeto =   collision.gameObject;
        if (shotByPlayer == 1){
            if (targeto.tag == ("Enemy"))
            targeto.GetComponent(typeof (enemyBehaviour)).TakeDamage(shotPower);
            Destroy(gameObject);
        }
    {

Is the problem perhaps that OnCollisionEnter belongs to colliders and not character controllers?

or perhaps that Boom() involves deleting the the player gameobject, i.e. screwing with the very thing unity is acccessing?

edit: ok so apparently it only crashes if the player is moving manually. If the collision is due to the scrolling then its all fine, but if I ram the enemy everything crashes