Location detail page crashes with AttributeError when custom objects have null object references

[anherrera]

Plugin Version

0.1.0

NetBox Version

4.2.9

Python Version

3.11

Steps to Reproduce

1. Create a custom object type with an optional location field
2. Create an instance with location=null
3. Try to view any location detail page
4. Page crashes with AttributeError

Expected Behavior

Location pages should handle null references gracefully

Observed Behavior

When custom objects have optional object fields with null values,
attempting to view any location detail page results in:

AttributeError: 'NoneType' object has no attribute 'id'

This completely breaks access to location pages in the NetBox UI.

[mrmrcoleman]

Recreated at:

NetBox version: v4.2.8-Docker-3.2.0
Custom Objects version: commit fe4827802c5bed230ac042bfdeba6beb328f1356 (HEAD -> main, origin/main, origin/HEAD)
Author: bctiemann <btiemann@netboxlabs.com>
Date:   Tue Jul 15 10:56:42 2025 -0400