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NullReferenceException Unity, why?

Unity

Started by retrometron Jun 7, 2018 at 1:38 PM 3 replies 2.5k views

Original Post

retrometron

Jun 7, 2018 at 1:38 PM

I have this code in Unity in an custom inspector in the method OnInspectorGUI():


MyCustomMonoBehaviour mono = target as MyCustomMonoBehaviour; 

List<Operation> myOperations = mono.operations;
myOperations.add(new Operation());

And I get this error, I don't know why:

> NullReferenceException: Object > reference not set to an instance of an > object MyTestEditor.OnInspectorGUI ()

Any idea?

Kylotan

Mod

3,487

Kylotan

Jun 7, 2018 at 1:52 PM

You would see this if 'target' is null, or 'target' is not actually a MyCustomMonoBehaviour, or target.operations was null. Use the debugger or Debug.Log to find out which.

retrometron

Author

retrometron

Jun 7, 2018 at 2:02 PM

yeah, thanks Kylotan, target seems to be null :O...

retrometron

Author

retrometron

Jun 7, 2018 at 2:10 PM

I fixed :), I initialized in OnEnable() and it's working fine, thanks very much.

A question, why do the people prefer to use new SerializedObject(target) instead?. That is how I saw in other examples.

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