PHP Fatal Error

The last update of this plugin is incompatible with PHP 5.4 and throws a “PHP Fatal error: Can’t use function return value in write context in /dir/wp-content/plugins/complete-open-graph/src/hooks/content-filters.php on line 54”

To fix this I changed line 54 from:

if (empty(get_avatar($userID))) {
    return $value;
}

to:

$avatar = get_avatar($userID);
if (empty($avatar)) {
    return $value;
}

Because prior to PHP 5.5, empty() only supports variables; anything else will result in a parse error
https://php.net/manual/en/function.empty.php