Creation of dynamic property page::$index is deprecated

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Describe the bug

I've newly installed this app and it doesn't seem able to load any page. When I try to load it, I get three errors:

• Deprecated: Creation of dynamic property page::$index is deprecated in /var/www/phpldapadmin/lib/page.php on line 38
• Deprecated: Creation of dynamic property page::$sysmsg is deprecated in /var/www/phpldapadmin/lib/page.php on line 468
• Deprecated: Creation of dynamic property page::$_block is deprecated in /var/www/phpldapadmin/lib/page.php on line 241

Then, inside the page itself, I get a more extensive stack trace:

(Screenshot from mobile, I'm trying to use the app because I currently don't have access to a laptop)

Context

• Hardware: VPS bought online
• YunoHost version: 11.2.9.1
• I have access to my server: currently only through the webadmin, normally I also have SSH access
• Are you in a special context or did you perform some particular tweaking on your YunoHost instance?: no

Steps to reproduce

It happens when opening a newly installed instance.

Expected behavior

The page is loaded without errors.

Logs

There are no error logs, but here are the installation logs: https://paste.yunohost.org/raw/avoluyahac

Start by inspecting lib/page.php at lines 38, 241, and 468, then reproduce the problem by opening a newly installed instance. Check the installation logs linked in the issue for context. Done means the page loads without the reported dynamic-property deprecation errors.