Problem s praci s Nette\Database a volanim procedury

Potreboval bych pracovat s takovouto strukturou aplikace, ale nedari se mi to timto zpusobem. Nevite jak by se to dalo poupravit?

Model

    /**
     * Vrati data do kalendare konkretniho tymu
     * @return array
     */
    public function getCalendar() {
        return $this->database->query('CALL kalendar(?)', $this->team->tym_id);;
    }

    /**
     * Vrati dny ve kterych tym obdrzel vyzvu na zápas
     * @return \Nette\Database\Table\Selection
     */
    public function getVyzva() {
        $date = new \DateTime();
        return $this->database->table('utkani')->where('tymVyzyvany_id', $this->team->tym_id)->where('akceptovano = 0')->where('DATE(datumCas) > ?', $date->format('Y-m-d'));
    }

Presenter:

            foreach ($this->context->calendarCalendar->calendar AS $c) {
            	$events = ...
            }

            foreach ($this->context->calendarCalendar->vyzva AS $v) {
            	$events = ...
            }

	$this->sendResponse(new JsonResponse($events));

Server mi vsak hlasi chybu:

SQLSTATE[HY000]: General error: 2014 Cannot execute queries while other unbuffered queries are active. Consider using PDOStatement::fetchAll(). Alternatively, if your code is only ever going to run against mysql, you may enable query buffering by setting the PDO::MYSQL_ATTR_USE_BUFFERED_QUERY attribute.