A bunch of properties are created dynamically, which is deprecated

[msalle]

In class SSL_ALP in includes/class-ssl-alp.php the following are declared dynamically (and accessed outside of the class too).
Easiest way to fix is to declared them as public explicitly:

public $core;
public $tools;
public $auth;
public $search;
public $terms;
public $inventory;
public $pages;
public $coauthors;
public $revisions;
public $references;
public $tex;