Cannot access empty property error in Advanced Access Manager

Question

As explained in the reply of this post by the Advanced Access Manager's author I've changed the current getCurrentUserRole function in the path /wp-content/plugins/advanced_access_manager/module with this new code:

function getCurrentUserRole() {
    if (is_object($this->data) && isset($this->data->{$this->cap_key})) {
       $result = $this->data->{$this->cap_key};
    } else {
       $result = array();
    }    
    return $result;
}

But I get an error when trying to access through www.foosite.com/wp-admin. Here is the apache log error message:

PHP Fatal error: Cannot access empty property in /var/www/foosite/wp-content/plugins/advanced-access-manager/module/class-module_user.php on line 29

The line error corresponds with the if statement, so I've tried to fix it using isset:

function getCurrentUserRole() {
    if (isset($this->data) && is_object($this->data) && is_array($this->data->{$this->cap_key})) {
        $result = array_keys($this->data->{$this->cap_key});
    } else {
        $result = array();
    }
    return $result;
}

Unfortunately the error remains the same.

Any suggestions?

Answer 1

Here is the solution I've made that it's now working properly:

function getCurrentUserRole() {
  if (isset($this->data) && isset($this->data->{$this->cap_key}) && is_object($this->data) && is_array($this->data->{$this->cap_key}) ) {
     $result = array_keys($this->data->{$this->cap_key});
  } else {
     $result = array();
  }

  return $result;
}