Destroying GameObject from inside FSM

This topic has 0 replies, 2 voices, and was last updated 11 years ago by Gavalakis.

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May 27, 2015 at 12:13 pm #19062

noio

Participant

I’m trying to destroy the object that controls the FSM (in order to upgrade him to another unit type).

Simple, in theory:

FSM

But I keep getting this error:

NullReferenceException: Object reference not set to an instance of an object

NodeCanvas.StateMachines.FSM.OnGraphUpdate () (at Assets/NodeCanvas/Modules/StateCanvas/FSM.cs:72)

ParadoxNotion.Services.MonoManager.Update () (at Assets/NodeCanvas/Framework/_ParadoxNotion (shared)/Runtime/Services/MonoManager.cs:51)

I have also tried to put the “Destroy(gameObject)” call inside the method ( PromoteFromFSM() ), but the same thing happens.

I used to have a workaround:

IEnumerator DestroyLater()

{

yield return null;

Destroy(gameObject);

}

But this extra frame of waiting time was causing _other_ trouble. I’d rather just destroy “right away”.

May 27, 2015 at 2:29 pm #19065

Gavalakis

Keymaster

Hello,

Please add a null check for the currentState at line #72:

if (currentState != null && currentState.status == Status.Running && CallbackStay != null)

CallbackStay(currentState);

The DestroyGameObject action is created to be called in the Update method of the action (instead of OnExecute) and exactly before the line of error, the current state Update is called, and thus the problem.

I’ve tested with the null check now and works as expected, but let me know.

Thanks!

May 27, 2015 at 3:40 pm #19064

noio

Participant

Thank you so much! You are unbelievably fast 😀

By changing this, does that mean it’s possible to call Destroy(gameObject) from ‘generic’ ExecuteFunction actions too?

May 27, 2015 at 4:04 pm #19063

Gavalakis

Keymaster

You are welcome and thanks 🙂

Yeah. I just tested this to confirm and works fine 🙂

Cheers!

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