function wc_render_invalid_variation_notice( $product_object ) {
	global $wpdb;

	// Give ability for extensions to hide this notice.
	if ( ! apply_filters( 'woocommerce_show_invalid_variations_notice', true, $product_object ) ) {
		return;
	}

	$variation_ids = $product_object ? $product_object->get_children() : array();

	if ( empty( $variation_ids ) ) {
		return;
	}

	$variation_count = count( $variation_ids );

	// Check if a variation exists without pricing data.
	// phpcs:disable WordPress.DB.PreparedSQL.NotPrepared
	$invalid_variation_count = $wpdb->get_var(
		"
		SELECT count(post_id) FROM {$wpdb->postmeta}
		WHERE post_id in (" . implode( ',', array_map( 'absint', $variation_ids ) ) . ")
		AND meta_key='_price'
		AND meta_value >= 0
		AND meta_value != ''
		"
	);
	// phpcs:enable WordPress.DB.PreparedSQL.NotPrepared

	if ( 0 < ( $variation_count - $invalid_variation_count ) ) {
		?>
		<div id="message" class="inline notice woocommerce-message woocommerce-notice-invalid-variation">
			<p>
			<?php
			echo wp_kses_post(
				sprintf(
					/* Translators: %d variation count. */
					_n( '%d variation does not have a price.', '%d variations do not have prices.', ( $variation_count - $invalid_variation_count ), 'woocommerce' ),
					( $variation_count - $invalid_variation_count )
				) . '&nbsp;' .
				__( 'Variations (and their attributes) that do not have prices will not be shown in your store.', 'woocommerce' )
			);
			?>
			</p>
		</div>
		<?php
	}
}