Statamic Navigation - unable to link collections or create Link to Entry

[Smilodown]

Bug description

Hi everyone,
On a Statamic fresh install, i just created Posts collection.
I'd like to link Posts ans Pages to navigation items, but when I select the Collections selector, it shows :

On the console :

I didn't have this error before....

I'm stuck right now. My Pro licences are useless for now.

How to reproduce

Install Statamic (CLI)
Create Posts Collection (no blueprint attached)
Create Navigation
Configure Navigation > Try to select Pages/Posts on the Collection Selector

Logs

No response

Environment

MAMP Pro :
PHP: 8.1
Statamic: 3.3.58
Coffee : Nespresso Pixie

Installation

Fresh statamic/statamic site via CLI

Antlers Parser

No response

Additional details

No response

[stephanbouman]

I have the same issue. Fresh statamic installation and tried running with Artisan Serve. The error on the php-side:

{
  "message": "Trying to access array offset on value of type null",
  "exception": "ErrorException",
  "file": "/Users/username/Projects/demoproject/vendor/statamic/cms/src/Http/Controllers/CP/Fieldtypes/RelationshipFieldtypeController.php",
  "line": 47
}

The same issue appears when you try to select an entry from an 'entries' field.

Edit:
See: #6823
When you update php 8.1.2+ it should work again. Tested it with php 8.1.11.

[Smilodown]

@stephanbouman
Just gave a try and ! Ta-dam ! It works again.
As you said, it must be a PHP 8.0 & PHP 8.1 specific issue.
Thanks a lot ! You saved my day.

[jasonvarga]

Closing this as it's so specific to that PHP version. Upgrading PHP from 8.1.0 to at least 8.1.2 will fix it. Nice detective work.