Thank’s John, that’s worked.
My working code is below for reference.
// check if the repeater field has rows of data
if( have_rows('sections') ):
while ( have_rows('sections') ) : the_row();
$title = get_sub_field('title');
$section = get_sub_field('section'); ?>
<div class = "gen_section" id = "section_<?php echo $title; ?>">
<div class = "wrap">
<!--Need get_template_part here ($icon)-->
<span class = "icon_span"><?php if ( $icon ) { get_template_part('svg/inline', get_sub_field('icon')); } ?>
<h2 class = "section-title"> <?php echo $title; ?> </h2>
</span>
<?php echo $section; ?>
</div>
</div> <?php
endwhile;
else :
// no rows found
endif; ?>
