Bug (?): BBParameter throws MissingReferenceException on `isNull` checks.

[guyboots_thunderbroParticipant]

I have a custom task with a field like this:

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[BlackboardOnly] public BBParameter<transform> target;

And usage like this:

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if (target.isNull) {   EndAction(false);   return; }

This code throws a ‘MissingReferenceException’:

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MissingReferenceException: The object of type 'GameObject' has been destroyed but you are still trying to access it.

This is probably because the BBParameter<T>.isNull tries to access GameObject.transform before checking to see if the parent object (GameObject) is actually still valid.

I can resolve this in a ham-fisted way by using BBParameter<GameObject> and follow the indirection myself, but it feels sloppy and like it should be handled inside of NodeCanvas itself.

[GavalakisKeymaster]

Hello and sorry for the late reply due to xmas vacation.

Thanks for your suggestion. I’ve just fixed this. I have also attached for you here the relevant file fix in a unitypackage.
Let me know if that works for you.

Thanks 🙂

[Author]

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