Game Maker: Game crashing when collision happens.

Hey, I'm trying to make it so that when 2 objects collide, one gets destroyed while the other remains. I've almost done that, but as soon as the objects collide, the game crashes. I am unsure why, and I haven't experienced this before. So if someone could even just point me in a good direction, that would be appreciated.

This is the collision event on one object ("EnemySpaceship"), and ties to the other object ("Spaceship1"). I have a drag and drop action to "Destroy the Instance", and then another action of code which is:

EnemySpawn.dead = true;

Then I have an object called "EnemySpawn" which sorts the spawning for the enemy. It has a Create event with the code:

instance_create(x,y, EnemySpaceship)

It also has an Alarm event with the code:

instance_create(x, y, EnemySpaceship);

And finally it has a Step event with the code:

if dead = true
{
alarm[0] = 60
dead = false
}

The error that comes up says:

"FATAL ERROR in
action number 2
of Step EventSpaceship1
for object EnemySpaceship:

Unable to find any instance for object index '2' name 'EnemySpawn'
at gml_Object_EnemySpaceship_CollisionEvent_0_2 (line 1) - EnemySpawn.dead = true;"

I think that's all I can supply for it, Thanks for taking the time to look at it.