multidimensional repeaters in ACF throwing warnings

<?php
global $post;
if ( function_exists( 'acf_add_local_field_group' ) ) :

	acf_add_local_field_group(array(
		'key' => 'group_58bff7f25c321',
		'title' => 'Garderobsbyggaren',
		'fields' => array(),
		'location' => array(
			array(
				array(
					'param' => 'post_type',
					'operator' => '==',
					'value' => 'product',
				),
			),
		),
		'menu_order' => 0,
		'position' => 'normal',
		'style' => 'default',
		'label_placement' => 'top',
		'instruction_placement' => 'label',
		'hide_on_screen' => '',
		'active' => 1,
		'description' => '',
	));


	/**
	 * Instructions at the top!
	 */
	acf_add_local_field(
		array(
			'key' => 'field_58bffffb60ca1',
			'label' => 'Instruktioner',
			'name' => '',
			'type' => 'message',
			'instructions' => '',
			'required' => 0,
			'conditional_logic' => 0,
			'wrapper' => array(
				'width' => '',
				'class' => '',
				'id' => '',
			),
			'message' => 'Börja med att bestämma alla stommar. Spara sedan produkten. Då får ni alla uppdaterade val för övriga komponenter.',
			'new_lines' => 'wpautop',
			'esc_html' => 0,
			'parent' => 'group_58bff7f25c321',
		)
	);


	/**
	 * Stommar
	 */
	acf_add_local_field(
		array(
			'key' => 'field_58bff7f85e02b',
			'label' => 'Stommar',
			'name' => 'bases',
			'type' => 'repeater',
			'instructions' => '',
			'required' => 0,
			'conditional_logic' => 0,
			'wrapper' => array(
				'width' => '',
				'class' => '',
				'id' => '',
			),
			'collapsed' => 'field_58bff82c5e02d',
			'min' => 0,
			'max' => 0,
			'layout' => 'block',
			'button_label' => '+ Lägg till stomme',
			'parent' => 'group_58bff7f25c321',
			'sub_fields' => array(),
		)
	);

	/**
	 * Title for base
	 */
	acf_add_local_field(
		array(
			'key' => 'field_58bff82c5e02d',
			'label' => 'Titel',
			'name' => 'title',
			'type' => 'text',
			'instructions' => '',
			'required' => 1,
			'conditional_logic' => 0,
			'wrapper' => array(
				'width' => '50',
				'class' => '',
				'id' => '',
			),
			'default_value' => '',
			'placeholder' => '',
			'parent' => 'field_58bff7f85e02b',
		)
	);

	/**
	 * Image for base
	 */
	acf_add_local_field(
		array(
			'key' => 'field_58bffa8e5e02e',
			'label' => 'Bild',
			'name' => 'image',
			'type' => 'image',
			'instructions' => '',
			'required' => 1,
			'conditional_logic' => 0,
			'wrapper' => array(
				'width' => '50',
				'class' => '',
				'id' => '',
			),
			'return_format' => 'array',
			'preview_size' => 'medium',
			'library' => 'all',
			'min_width' => '',
			'min_height' => '',
			'min_size' => '',
			'max_width' => '',
			'max_height' => '',
			'max_size' => '',
			'mime_types' => '',
			'parent' => 'field_58bff7f85e02b',
		)
	);

	/**
	 * Height for base
	 */
	acf_add_local_field(
		array(
			'key' => 'field_58bff82c5e02c',
			'label' => 'Höjd',
			'name' => 'height',
			'type' => 'number',
			'instructions' => '',
			'required' => 1,
			'conditional_logic' => 0,
			'wrapper' => array(
				'width' => '33',
				'class' => '',
				'id' => '',
			),
			'default_value' => '',
			'placeholder' => '',
			'prepend' => '',
			'append' => 'mm',
			'min' => '',
			'max' => '',
			'step' => 1,
			'parent' => 'field_58bff7f85e02b',
		)
	);


	/**
	 * Width for base
	 */
	acf_add_local_field(
		array(
			'key' => 'field_58bff9f45e02d',
			'label' => 'Bredd',
			'name' => 'width',
			'type' => 'number',
			'instructions' => '',
			'required' => 1,
			'conditional_logic' => 0,
			'wrapper' => array(
				'width' => '33',
				'class' => '',
				'id' => '',
			),
			'default_value' => '',
			'placeholder' => '',
			'prepend' => '',
			'append' => 'mm',
			'min' => '',
			'max' => '',
			'step' => 1,
			'parent' => 'field_58bff7f85e02b',
		)
	);



	/**
	 * Price for base
	 */
	acf_add_local_field(
		array(
			'key' => 'field_58bff9f45e02g',
			'label' => 'Pris',
			'name' => 'price',
			'type' => 'number',
			'instructions' => '',
			'required' => 1,
			'conditional_logic' => 0,
			'wrapper' => array(
				'width' => '33',
				'class' => '',
				'id' => '',
			),
			'default_value' => 0,
			'placeholder' => '',
			'prepend' => '',
			'append' => 'SEK/st',
			'min' => 0,
			'max' => '',
			'step' => 1,
			'parent' => 'field_58bff7f85e02b',
		)
	);



	/**
	 * Extra save button. Just for good measure.
	 */
	acf_add_local_field(
		array(
			'key' => 'field_58bffffb60ca2',
			'label' => '',
			'name' => '',
			'type' => 'message',
			'instructions' => '',
			'required' => 0,
			'conditional_logic' => 0,
			'wrapper' => array(
				'width' => '',
				'class' => 'save-bases-button',
				'id' => '',
			),
			'message' => '<button type="submit" class="button-primary">' . __( 'Spara stommar', 'byggaren' ) . '</button>',
			'new_lines' => 'wpautop',
			'esc_html' => 0,
			'parent' => 'group_58bff7f25c321',
		)
	);

	/**
	 * Decoration (inredning)
	 */
	acf_add_local_field(
		array(
			'key' => 'field_decoration',
			'label' => 'Inredning',
			'name' => 'decorations',
			'type' => 'repeater',
			'instructions' => '',
			'required' => 0,
			'wrapper' => array(
				'width' => '',
				'class' => '',
				'id' => '',
			),
			'collapsed' => 'field_decoration_title',
			'min' => 0,
			'max' => 0,
			'layout' => 'table',
			'button_label' => '+ Lägg till inredning',
			'parent' => 'field_58bff7f85e02b',
			'sub_fields' => array(
				array(
					'key' => 'field_decoration_title',
					'label' => 'Titel',
					'name' => 'title',
					'type' => 'text',
					'instructions' => '',
					'required' => 1,
					'conditional_logic' => 0,
					'wrapper' => array(
						'width' => '50',
						'class' => '',
						'id' => '',
					),
					'default_value' => '',
					'placeholder' => '',
					'prepend' => '',
					'append' => '',
					'max_length' => '',
					'readonly' => 0,
					'disabled' => 0,
				),
				array(
					'key' => 'field_decoration_image',
					'label' => 'Bild',
					'name' => 'image',
					'type' => 'image',
					'instructions' => '',
					'required' => 0,
					'conditional_logic' => 0,
					'wrapper' => array(
						'width' => '25',
						'class' => '',
						'id' => '',
					),
					'return_format' => 'array',
					'preview_size' => 'medium',
					'library' => 'all',
					'min_width' => '',
					'min_height' => '',
					'min_size' => '',
					'max_width' => '',
					'max_height' => '',
					'max_size' => '',
					'mime_types' => '',
				),
				array(
					'key' => 'field_decoration_price',
					'label' => 'Pris',
					'name' => 'price',
					'type' => 'number',
					'instructions' => '',
					'required' => 1,
					'conditional_logic' => 0,
					'wrapper' => array(
						'width' => '25',
						'class' => '',
						'id' => '',
					),
					'default_value' => 0,
					'placeholder' => '',
					'prepend' => '',
					'append' => 'SEK/st',
					'min' => 0,
					'max' => '',
					'step' => 1,
				),
			),
		)
	);


	/**
	 * Garderobsbyggaren - Doors
	 */
	acf_add_local_field(
		array(
			'key' => 'field_doors',
			'label' => 'Dörrar',
			'name' => 'doors',
			'type' => 'repeater',
			'instructions' => '',
			'required' => 0,
			'wrapper' => array(
				'width' => '',
				'class' => '',
				'id' => '',
			),
			'collapsed' => 'field_door_title',
			'min' => 0,
			'max' => 0,
			'layout' => 'table',
			'button_label' => '+ Lägg till dörr',
			'parent' => 'field_58bff7f85e02b',
			'sub_fields' => array(
				array(
					'key' => 'field_door_title',
					'label' => 'Titel',
					'name' => 'title',
					'type' => 'text',
					'instructions' => '',
					'required' => 1,
					'conditional_logic' => 0,
					'wrapper' => array(
						'width' => '50',
						'class' => '',
						'id' => '',
					),
					'default_value' => '',
					'placeholder' => '',
				),
				array(
					'key' => 'field_door_image',
					'label' => 'Bild',
					'name' => 'image',
					'type' => 'image',
					'instructions' => '',
					'required' => 0,
					'conditional_logic' => 0,
					'wrapper' => array(
						'width' => '25',
						'class' => '',
						'id' => '',
					),
					'return_format' => 'array',
					'preview_size' => 'medium',
					'library' => 'all',
					'min_width' => '',
					'min_height' => '',
					'min_size' => '',
					'max_width' => '',
					'max_height' => '',
					'max_size' => '',
					'mime_types' => '',
				),
				array(
					'key' => 'field_door_price',
					'label' => 'Pris',
					'name' => 'price',
					'type' => 'number',
					'instructions' => '',
					'required' => 1,
					'conditional_logic' => 0,
					'wrapper' => array(
						'width' => '25',
						'class' => '',
						'id' => '',
					),
					'default_value' => 0,
					'placeholder' => '',
					'prepend' => '',
					'append' => 'SEK/st',
					'min' => 0,
					'max' => '',
					'step' => 1,
				),
			),
		)
	);

endif;