Invalid structure item breaks entry augmentation

[morhi]

Bug description

When trying to augment an entry (->toAugmentedArray()) I discovered a array_flip error (array_flip(): Can only flip string and integer values). This is error comes from the Entry::order() call. I found out that the structure contains a null item, which breaks the array_flip call. My appeal would be to make the order() call more robust and research the structure saving issue in a different issue.

How to reproduce

I do not know why the structure has a null item in the first place, but the structure simply needs to contain a null item:

[{"entry":"4ed307c6-0567-4ed2-a6be-c651832f57ee"},null]

Environment

Environment
Application Name: Statamic
Laravel Version: 11.54.0
PHP Version: 8.2.29
Composer Version: 2.9.5
Environment: local
Debug Mode: ENABLED
URL: sonntag.ddev.site
Maintenance Mode: OFF
Timezone: Europe/Zurich
Locale: de

Cache
Config: NOT CACHED
Events: NOT CACHED
Routes: NOT CACHED
Views: CACHED

Drivers
Broadcasting: null
Cache: file
Database: mysql
Logs: stack / single
Mail: smtp
Queue: sync
Session: file

Livewire
Livewire: v4.3.1

Statamic
Addons: 18
Sites: 1
Stache Watcher: Enabled (auto)
Static Caching: Disabled
Version: 5.73.24 PRO

Installation

Other (please explain)

Additional details

No response