Question NullReference when trying to retreive boxed value from SerializedProperty

Hello ! I have an AudioMixerGroup as a SerializedObject.
try to fetch the GUID of its "m_Volume" property.
The "type" is indeed a GUID, the "propertyType" is Generic
I verified that the SerializedProperty is not null
I tried to use boxedValue to get the GUID struct but I only get a null reference error
Is there something I didn't understand ?

Error stack


code implementation

AudioMixerGroup serialization

 

Start debugging. Is child null? Is the Property you are looking for null? You need to figure out what is null first!

1. Find out what is null
2. Find out why it's null
3. Fix it

The steps are pretty much the same always!

 

None is null, neither the child (AudioMixerGroup as SerializedObject) nor the property (m_Volume)

 

You verified this by debug.log those values?
AudioUtils.cs line 121 has the null value. So, something is null there or you wouldn't get a null error.

 

Yes, I verified it

Test

Console

 

Looks like boxedValue is null. Since this is returned as an object, it is possible for it to be null.
https://docs.unity3d.com/2022.2/Documentation/ScriptReference/SerializedProperty-boxedValue.html

Based on the docs, there was something about generic types, so maybe it applies to your case. I'd just verify it.

 

AFAIK unity really dislikes GUIDs, and doesn't serialize them.

 

Ok, let's assume that Unity won't allow me to get the boxed value of this GUID...the question is, how do I access this property value then ? It is right there

 

Can you just get it as a string?

 

It throws me a "Type is not a supported string value"