ACF repeater in group

tpl.php

<?php

// Stop if there's nothing to display.
if ( ! have_rows( 'services', 'option' ) ) {
	return false;
}

if ( have_rows( 'services', 'option' ) ) : ?>

		<?php while ( have_rows( 'services', 'option' ) ) : the_row();

			// Services Sub Repeater.
			if ( have_rows( 'services_list' ) ) : ?>

			<ul class="services">

			       <?php
			       while ( have_rows( 'services_list' ) ) : the_row();

				       $image = get_sub_field( 'icon' );
				       $title = get_sub_field( 'service_title' );
			       ?>

				<li class="services-single">
					<img src="<?php echo esc_url( $image['sizes']['thumbnail'] ); ?>" alt="<?php echo esc_html( $image['alt'] ); ?>"?>
					<?php echo esc_html( $title ); ?>
				</li>

			       <?php endwhile; ?> 
			</ul>

		       <?php endif; ?>
		<?php endwhile; ?>
<?php endif; ?>