In case you are using a repeater, I would recommend that you use a the standard repeater loop to access the repeater rows.
// check if the repeater field has rows of data
if( have_rows('repeater_field_name') ):
// loop through the rows of data
while ( have_rows('repeater_field_name') ) : the_row();
// display a sub field value
// no rows found
If you just want the first row, you can introduce custom code to only pick the first row.
I hope this helps.
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