Error + stacktrace

{
    "name": "PHP Notice",
    "message": "Undefined index: rental_id",
    "code": 8,
    "type": "yii\\base\\ErrorException",
    "file": "\/var\/www\/vhosts\/domain.tld\/subdomains\/dev\/httpdocs\/folder\/api\/vendor\/yiisoft\/yii2\/db\/ActiveRelationTrait.php",
    "line": 459,
    "stack-trace": [
        "#0 \/var\/www\/vhosts\/domain.tld\/subdomains\/dev\/httpdocs\/folder\/api\/vendor\/yiisoft\/yii2\/db\/ActiveRelationTrait.php(459): yii\\base\\ErrorHandler->handleError(8, 'Undefined index...', '\/var\/www\/vhosts...', 459, Array)",
        "#1 \/var\/www\/vhosts\/domain.tld\/subdomains\/dev\/httpdocs\/folder\/api\/vendor\/yiisoft\/yii2\/db\/ActiveRelationTrait.php(217): yii\\db\\ActiveQuery->filterByModels(Array)",
        "#2 \/var\/www\/vhosts\/domain.tld\/subdomains\/dev\/httpdocs\/folder\/api\/vendor\/yiisoft\/yii2\/db\/ActiveQueryTrait.php(174): yii\\db\\ActiveQuery->populateRelation('rentalType', Array)",
        "#3 \/var\/www\/vhosts\/domain.tld\/subdomains\/dev\/httpdocs\/folder\/api\/vendor\/yiisoft\/yii2\/db\/ActiveQuery.php(215): yii\\db\\ActiveQuery->findWith(Array, Array)",
        "#4 \/var\/www\/vhosts\/domain.tld\/subdomains\/dev\/httpdocs\/folder\/api\/vendor\/yiisoft\/yii2\/db\/Query.php(211): yii\\db\\ActiveQuery->populate(Array)",
        "#5 \/var\/www\/vhosts\/domain.tld\/subdomains\/dev\/httpdocs\/folder\/api\/vendor\/yiisoft\/yii2\/db\/ActiveQuery.php(133): yii\\db\\Query->all(Object(yii\\db\\Connection))",
        "#6 \/var\/www\/vhosts\/domain.tld\/subdomains\/dev\/httpdocs\/folder\/api\/vendor\/digizijn\/framework\/base\/ActiveQuery.php(191): yii\\db\\ActiveQuery->all(Object(yii\\db\\Connection))",
        "#7 [internal function]: us\\base\\ActiveQuery->us\\base\\{closure}(Object(yii\\db\\Connection))",
        "#8 \/var\/www\/vhosts\/domain.tld\/subdomains\/dev\/httpdocs\/folder\/api\/vendor\/yiisoft\/yii2\/db\/Connection.php(432): call_user_func(Object(Closure), Object(yii\\db\\Connection))",
        "#9 \/var\/www\/vhosts\/domain.tld\/subdomains\/dev\/httpdocs\/folder\/api\/vendor\/digizijn\/framework\/base\/ActiveQuery.php(193): yii\\db\\Connection->cache(Object(Closure), 3600)",
        "#10 \/var\/www\/vhosts\/domain.tld\/subdomains\/dev\/httpdocs\/folder\/api\/vendor\/digizijn\/framework\/base\/ActiveQuery.php(110): us\\base\\ActiveQuery->run('all', NULL, Object(yii\\db\\Connection))",
        "#11 \/var\/www\/vhosts\/domain.tld\/subdomains\/dev\/httpdocs\/folder\/api\/vendor\/digizijn\/framework\/queries\/RecreationRentalPeriodQuery.php(79): us\\base\\ActiveQuery->all()",
        "#12 \/var\/www\/vhosts\/domain.tld\/subdomains\/dev\/httpdocs\/folder\/api\/vendor\/digizijn\/framework\/models\/database\/RecreationEvents.php(861): app\\vendor\\digizijn\\framework\\queries\\RecreationRentalPeriodQuery->byAmountOfNights(Object(us\\models\\database\\RecreationObjectType), 1)",
        "#13 \/var\/www\/vhosts\/domain.tld\/subdomains\/dev\/httpdocs\/folder\/api\/controllers\/RecreationBookingController.php(292): us\\models\\database\\RecreationEvents->setPeriodPrices()",
        "#14 [internal function]: app\\controllers\\RecreationBookingController->actionPricing('52', '2017-01-01', '2017-01-28', 1, 21, 2)",
        "#15 \/var\/www\/vhosts\/domain.tld\/subdomains\/dev\/httpdocs\/folder\/api\/vendor\/yiisoft\/yii2\/base\/InlineAction.php(55): call_user_func_array(Array, Array)",
        "#16 \/var\/www\/vhosts\/domain.tld\/subdomains\/dev\/httpdocs\/folder\/api\/vendor\/yiisoft\/yii2\/base\/Controller.php(154): yii\\base\\InlineAction->runWithParams(Array)",
        "#17 \/var\/www\/vhosts\/domain.tld\/subdomains\/dev\/httpdocs\/folder\/api\/vendor\/yiisoft\/yii2\/base\/Module.php(454): yii\\base\\Controller->runAction('pricing', Array)",
        "#18 \/var\/www\/vhosts\/domain.tld\/subdomains\/dev\/httpdocs\/folder\/api\/vendor\/yiisoft\/yii2\/web\/Application.php(100): yii\\base\\Module->runAction('recreation-book...', Array)",
        "#19 \/var\/www\/vhosts\/domain.tld\/subdomains\/dev\/httpdocs\/folder\/api\/vendor\/yiisoft\/yii2\/base\/Application.php(375): yii\\web\\Application->handleRequest(Object(yii\\web\\Request))",
        "#20 \/var\/www\/vhosts\/domain.tld\/subdomains\/dev\/httpdocs\/folder\/api\/web\/index.php(40): yii\\base\\Application->run()",
        "#21 {main}"
    ],

RecreationObject.php

<?php
/**
 * @property integer $object_id
 * @property integer $type_id
 * ...
 */
class RecreationObject extends \us\base\ActiveRecord implements Linkable, Filterable {
	use Filtering;

  /* .. */  
	public function getObjectType() {
		return $this->hasOne(RecreationObjectType::className(), ['type_id' => 'type_id'])->inverseOf('objects');
	}
  /* .. */  
}

RecreationObjectRentalConnection.php

<?php
/**
 * @property integer $conn_id
 * @property integer $object_id
 * @property integer $rental_id
 * ...
 */
class RecreationObjectRentalConnection extends \us\base\ActiveRecord {
  /* .. */  
	public function getRentalType() {
		return $this->hasOne(RecreationRentalType::className(), ['rental_id' => 'rental_id'])->inverseOf('rentalTypeConnection');
	}

	public function getObjects()
	{
		return $this->hasMany(RecreationObject::className(), ['object_id' => 'object_id'])->inverseOf('rentalConnection');
	}
  /* .. */
}

RecreationObjectType.php

<?php
/**
 * @property integer $type_id
 * ...
 */
class RecreationObjectType extends \us\base\ActiveRecord implements Linkable, Filterable {
	use Filtering;
	
  /* .. */ 
	public function getObjects() {
		return $this->hasMany(RecreationObject::className(), ['type_id' => 'type_id'])->inverseOf('objectType');
	}
  /* .. */ 
}

RecreationRentalPeriod.php

<?php

/**
 * @property integer $period_id
 * @property integer $rental_id
 * ...
 */
 
class RecreationRentalPeriod extends \us\base\ActiveRecord {
  /* .. */
	public function getRentalType() {
		return $this->hasOne(RecreationRentalType::className(), ['rental_id' => 'rental_id'])->inverseOf('rentalPeriod');
	} 
  /* .. */
}

RecreationRentalPeriodQuery.php

<?php

/* ... */

class RecreationRentalPeriodQuery extends ActiveQuery {

	/**
	 * @param RecreationObjectType $objectType
	 * @return static
	 */
	public function byObjectType(RecreationObjectType $objectType) {
		return $this->innerJoinWith([
			'rentalType.rentalTypeConnection.objects.objectType' => function($q) use ($objectType) {
				$modelClass = $q->modelClass;
				$q->andWhere([$modelClass::tableName().'.type_id' => $objectType->type_id]);
			}]
		);
	}


	public function byAmountOfNights(RecreationObjectType $objectType, $amountOfNights){
			/* ... */
			// TODO FIXME TODO FIXME TODO FIXME TODO FIXME TODO FIXME TODO FIXME
			$allPeriods	= RecreationRentalPeriod::find()->cache()
				->select([
					RecreationRentalPeriod::tableName().'.period_id',
					//RecreationRentalType::tableName().'.rental_id',
					//RecreationObjectRentalConnection::tableName().'.object_id',
					//RecreationObject::tableName().'.object_id',
					//RecreationObject::tableName().'.type_id',
					//RecreationObjectType::tableName().'.type_id',
				])
				->byObjectType($objectType)->groupBy(RecreationRentalPeriod::tableName().'.period_id')->asArray()->all();
     /* ... */
	}
}

RecreationRentalType.php

<?php
/**
 * @property integer $rental_id
 * ...
 */
class RecreationRentalType extends \us\base\ActiveRecord implements Linkable {	
  /* .. */
	public function getRentalTypeConnection() {
		return $this->hasMany(RecreationObjectRentalConnection::className(), ['rental_id' => 'rental_id'])->inverseOf('rentalType'); // TODO Resolve foreignKey ['rental_id' => 'rental_id']
	}
  /* .. */
}