Unable to get session lock within 60 seconds.

    class CSecuritySession

    /**
    * @param string $pMessage
    */
   public static function triggerFatalError($pMessage = "")
   {
      CHTTP::SetStatus("500 Internal Server Error");
      trigger_error($pMessage, E_USER_ERROR); //// <===71
      die();
   }

 class CSecuritySessionDB

  /**
   * @param string $id - session id, must be valid hash
   * @return string
   */
  public static function read($id)
  {
    if(!self::isValidId($id))
      return "";

    if(!CSecurityDB::Lock($id, 60/*TODO: timelimit from php.ini?*/))
      CSecuritySession::triggerFatalError('Unable to get session lock within 60 seconds.');// <===42

    $rs = CSecurityDB::Query("
      select SESSION_DATA
      from b_sec_session
      where SESSION_ID = '".$id."'
    ", "Module: security; Class: CSecuritySession; Function: read; File: ".__FILE__."; Line: ".__LINE__);
    $ar = CSecurityDB::Fetch($rs);
    if($ar)
    {
      $res = base64_decode($ar["SESSION_DATA"]);
      return $res;
    }

    return "";
  }

   function Lock($id, $timeout = 60)
   {
      static $lock_id = "";

      if($id === false)
      {
         if($lock_id)
            $rsLock = CSecurityDB::Query("DO RELEASE_LOCK('".$lock_id."')", "Module: security; Class: CSecurityDB; Function: Lock; File: ".__FILE__."; Line: ".__LINE__);
      }
      else
      {
         $rsLock = CSecurityDB::Query("SELECT GET_LOCK('".md5($id)."', ".intval($timeout).") as L", "Module: security; Class: CSecurityDB; Function: Lock; File: ".__FILE__."; Line: ".__LINE__);
         if($rsLock)
         {
            $arLock = CSecurityDB::Fetch($rsLock);
            if($arLock["L"]=="0")
               return false;
            else
               $lock_id = md5($id);
         }
      }
      return is_resource($rsLock);
   }