How to resolve Call to a member function result() error?

Question

PHP

Hello, friends!
A friend asked me to look at the site, they say everything was fine and suddenly an error.
Fatal error: Call to a member function result() on boolean in /web/htdocs/www.site.com/home/system/application/models/auth_model.php on line 511
Here is the error line
$result = $query->result();
Here is the function

function initialization_Acl() 
  {
    ini_set("include_path",APPPATH."libraries/");
    
    //Подклучаем зендовский загрузчик  
    require_once "Zend/Loader.php";
    $CI =& get_instance();
    $CI->db->query('SET NAMES utf8');
    
    //Загружаем необходимые нам библиотеки ( контроль доступа, роли, ресурсы )  
    Zend_Loader::loadClass('Zend_Acl');  
    Zend_Loader::loadClass('Zend_Acl_Role');  
    Zend_Loader::loadClass('Zend_Acl_Resource');  
     
    //Создаём новый объект контроля доступа  
    $acl = new Zend_Acl();  
     
    // определяем роли
    $query = $CI->db->query('SELECT * FROM `groups`');
    
    //print_r($query);
    //print "<br> --- ".$query->num_rows();
    $result = $query->result();
    
    if (is_array($result))
    {
      foreach ($result as $val)
      {
//				var_dump($val);
        $acl->addRole(new Zend_Acl_Role($val->id));		
        $acl->deny($val->id, null);
      }
    }
     
    //определяем ресурс  
    $query = $CI->db->query("SELECT * FROM `map` WHERE upId!=0 AND resource!=''");
    //print_r($query);
        
        
    $result = $query->result();
    
    if (is_array($result))
    {
      foreach ($result as $val)
      {
        //print"<br><br> ----- ".($val->resource);
        $acl->add(new Zend_Acl_Resource($val->resource));
        
//				echo 'T: ',$val->template,"<br>";
      }
    }
    
    // запрещяем какие либо действия с profile для guest'а и member'а  
  //	$acl->deny('guest','main');  
  //	$acl->deny('member','main');  
     
    // даем полный доступ admin'у для ресурса profile
    $query = $CI->db->query("SELECT * FROM `acl`");
    //print "<br> ----- ";
    //print_r($query);

    
    $result = $query->result();
    if (is_array($result))
    {
      foreach ($result as $val)
      {
//				var_dump($val);
        try
        {
          if ($val->action != '')
          {
            $acl->allow($val->group, $val->resource, $val->action);
//						echo $val->group,'/',$val->resource,$val->action;
          }
          else
          {
            $acl->allow($val->group, $val->resource);
//						echo $val->group,'/',$val->resource,'/',$val->action,"<br>";
          }
        }
        catch(Exception $e)
        {
//					echo 'EX: ',$val->group,'/',$val->resource,'/',$val->action,"<br>";
        }
      }
    }
  
    // разрешаем member'у доступ для ресурса profile на действия index и modify  
  //	$acl->allow('member' , 'main' , array('index','modify'));  
     
    return $acl;
  }

No matter how I look for answers and solutions, nothing happens.
Maybe someone knows how to solve the problem? If you need the whole file, I'll throw it off.
Help me please...