Trying to create an object with a GblBox property which is initialized to NULL throws warnings

This also happens when trying to read such properties.

Creating:
<img width="550" height="166" alt="Image" src="https://github.com/user-attachments/assets/70a5a1a0-f15f-48bc-a580-74dc40a752ff" />


Reading:
<img width="552" height="79" alt="Image" src="https://github.com/user-attachments/assets/277b40f4-0517-423c-9a5c-d67cda2c7c51" />