Cake5: Typed static property Muffin\Footprint\FootprintPlugin::$listener must not be accessed before initialization

[LordSimal]

I get the following error after upgrading to my App to current Cake5 RC1:

Typed static property Muffin\Footprint\FootprintPlugin::$listener must not be accessed before initialization
ROOT/vendor/muffin/footprint/src/FootprintPlugin.php at line 46

Proposed solution

change

protected static ?FootprintListener $listener;

to

protected static ?FootprintListener $listener = null;