We are using :

    "koolreport/core":"4.5.1",
    "koolreport/querybuilder":"2.5.0",

and get a lot of notice errors in our central Sentry system:

Could you please fix them. should be an easy fix.

  public function getData()
    {

        // Reusable components.
        $sqlUnsubscribeRequests = (new Query())
            ->from('order_item')
            ->selectRaw('IF(course.id IS NOT NULL,course.stop_request_date,course_subscription.stop_date)')->alias('gewenste_stopdatum')
            ->selectRaw('IF(course.id IS NOT NULL,course.stop_reason,course_subscription.stop_reason)')->alias('reden')
            ->selectRaw('CONCAT_WS(" ",NULLIF(auth_user.salutation,""), NULLIF(auth_user.firstname,""), NULLIF(auth_user.infix,""), NULLIF(auth_user.lastname,""))')->alias('naam')
            ->select('coursegroup.name')->alias('cursus')
            ->leftJoin('auth_user', 'auth_user.user_id', 'order_item.person_id')
            ->leftJoin('course', 'course.id', 'order_item.sub_item_id')
            ->leftJoin('course_subscription', 'course_subscription.id', 'order_item.subscription_id')
            ->leftJoin('coursegroup', 'coursegroup.id', 'order_item.item_id')
            ->where('order_item.status', '=', 'stop_requested')
            ->where('order_item.deleted', '=', 0);

        // Append filters.
        if(!empty($this->exportFilters['providerIdWithoutAll']['value'])) {
            $sqlUnsubscribeRequests->where('order_item.provider_id', '=', $this->exportFilters['providerIdWithoutAll']['value']);

            // currentyear opzoeken
            $arr_current_year = \VugronDefinedYear::getCurrentYear($this->exportFilters['providerIdWithoutAll']['value']);
            $sqlUnsubscribeRequests->where('coursegroup.year_id', '=', $arr_current_year['year_id']);

        }

        $rsUnsubscribeRequests = $this->dbConnection->query($sqlUnsubscribeRequests->toMySQL());
        $arrData = $rsUnsubscribeRequests->fetchAll(MDB2_FETCHMODE_ASSOC);

        return $arrData;

    }

from the ->toMySQL() execution it throws the notice.