Please change your code and use wp_get_current_user()

<b>Notice</b>: get_currentuserinfo is deprecated since version 4.5.0! Use wp_get_current_user() instead. in <b>/var/docs/mywebsite.tst/public/wp-includes/functions.php</b> on line <b>3828</b><br />

	//global $current_user;
	//get_currentuserinfo();
	$current_user = wp_get_current_user();

Version 6.5.2 of plugin in file google-analyticator.php line 1288

get_currentuserinfo is deprecated !